Contains a fix for an arm linker error (chromium:1058107) and
scaling beyond 64 threads on Windows.

Changes:
    94a361cf0 thread.cpp Fix minor bug in getProcessorGroups()
    0249a2624 Thread: Use WaitForObject for Thread::join()
    62f209bbb arm: Annotate marl_fiber_swap as type %function
    00f091e08 Update README.md
    773d9f475 Add new example 'tasks_in_tasks'
    3f69e73ce Scheduler: Replace use of std::thread with marl::Thread

Commands:
    git subtree pull --prefix third_party/marl https://github.com/google/marl master --squash

Bug: b/140546382
Bug: chromium:1058107
Change-Id: Ic5a96ad5f054a19f6a5a77e1f106c73ba60c0a78

94a361cf0 thread.cpp Fix minor bug in getProcessorGroups()
0249a2624 Thread: Use WaitForObject for Thread::join()
62f209bbb arm: Annotate marl_fiber_swap as type %function
00f091e08 Update README.md
773d9f475 Add new example 'tasks_in_tasks'
3f69e73ce Scheduler: Replace use of std::thread with marl::Thread

git-subtree-dir: third_party/marl
git-subtree-split: 94a361cf0b5187a5845f3a37c9e67c8406ccb40b

By setting the RPATH to $ORIGIN, Linux executables can behave like on
Windows and search for shared libraries in the exectuables directory
before looking elsewhere. We copy SwiftShader's Vulkan library into this
directory, naming it vulkan.so.1 to match the loader name the
executables look for.

This also relies on SwiftShader exporting all Vulkan API entry functions
like the loader library does: b/148240133

Bug: b/141361933
Change-Id: I617303cc11faead7aac9e689142a4400731a58a5
Reviewed-on: https://swiftshader-review.googlesource.com/c/SwiftShader/+/41970Tested-by: Nicolas Capens <nicolascapens@google.com>
Reviewed-by: Antonio Maiorano <amaiorano@google.com>

Test: none
Change-Id: I10ca476ed7dade95b516fabc1279fe751285114f
Reviewed-on: https://swiftshader-review.googlesource.com/c/SwiftShader/+/42128Tested-by: Nicolas Capens <nicolascapens@google.com>
Reviewed-by: Alexis Hétu <sugoi@google.com>
Reviewed-by: Ben Clayton <bclayton@google.com>

Using --dailynow --dailychange <hash> makes Regres check out the specified
change to obtain the vk-master.txt from and perform a full run of all the
tests.

Also fix --keep usage.

Bug: none
Change-Id: Ia126bfc136e6b86a6fcc570f79a9293ae97ca392
Reviewed-on: https://swiftshader-review.googlesource.com/c/SwiftShader/+/42109Tested-by: Nicolas Capens <nicolascapens@google.com>
Reviewed-by: Ben Clayton <bclayton@google.com>

https://swiftshader-review.googlesource.com/c/SwiftShader/+/40788 and
https://swiftshader-review.googlesource.com/c/SwiftShader/+/41968 cause
us to use different compile flags for Subzero's LLVM dependencies than
the rest of SwiftShader. Suppress the warnings that this has unleashed.

Bug: b/132445520
Change-Id: I1f20e32b487035e953c02cd4829460c072e38ac3
Reviewed-on: https://swiftshader-review.googlesource.com/c/SwiftShader/+/41969
Kokoro-Presubmit: kokoro <noreply+kokoro@google.com>
Reviewed-by: Antonio Maiorano <amaiorano@google.com>
Tested-by: Nicolas Capens <nicolascapens@google.com>

Add `filter` flag to run_testlist so that tests can be filtered by wildcard or regex.
Update `run_testlist.sh` and `run_testlist.bat` to automatically use the vk-master.txt test list.

Change-Id: I94ef1d2e9220f18bdf50555db8c291b3736ec3f3
Reviewed-on: https://swiftshader-review.googlesource.com/c/SwiftShader/+/42089Reviewed-by: Paul Thomson <paulthomson@google.com>
Reviewed-by: Nicolas Capens <nicolascapens@google.com>
Tested-by: Ben Clayton <bclayton@google.com>

The http URL now results in a redirect to an https URL.
Update the URL to the new redirect URL.
Also add the `-L` flag to curl so that future redirects don't break our presubmits.

Also verify with the provided PGP signatures instead of using a more vulnerable sha1.

Bug: none. Fixing presubmits.
Change-Id: I715c45f7083bf0f5528d82ba93d008464d0d7f88
Reviewed-on: https://swiftshader-review.googlesource.com/c/SwiftShader/+/42093Reviewed-by: Antonio Maiorano <amaiorano@google.com>
Tested-by: Ben Clayton <bclayton@google.com>

On some ABIs, C++ functions that return bool only set the least
significant bits of the return register (e.g. AL on x64). The Call
implementation in SubzeroReactor would use uninitialized i32 target
to hold the result of a bool-returning function, but this would return
erroneous results when the called function would return false by setting
the LSB to 0, but with a non-zero MSB, thus returning true.
This change makes sure to truncate the i32 result to i8 (bool),
returning true only if the lsb is non-zero.

Bug: b/151158858
Change-Id: I41055a94d7f8045da503f27881ed887c1926f77b
Reviewed-on: https://swiftshader-review.googlesource.com/c/SwiftShader/+/42068Tested-by: Antonio Maiorano <amaiorano@google.com>
Reviewed-by: Nicolas Capens <nicolascapens@google.com>

Change-Id: I57d7aaaaf85f009721b791ad15f20ea7971a9092
Reviewed-on: https://swiftshader-review.googlesource.com/c/SwiftShader/+/41988Reviewed-by: Nicolas Capens <nicolascapens@google.com>
Reviewed-by: Chris Forbes <chrisforbes@google.com>
Tested-by: Nicolas Capens <nicolascapens@google.com>
Kokoro-Presubmit: kokoro <noreply+kokoro@google.com>

Bug: b/149537975

Tests: dEQP-VK.*point*

Change-Id: I22ee0c0ebc4e7b414e055e2b87010004dfc8741a
Reviewed-on: https://swiftshader-review.googlesource.com/c/SwiftShader/+/41948Reviewed-by: Nicolas Capens <nicolascapens@google.com>
Tested-by: Marc-Antoine Desroches <madesroches@google.com>

This is a partial revert of https://swiftshader-review.googlesource.com/c/SwiftShader/+/40788
where .c files were renamed to .cpp to avoid a warning treated as error:
command line option ‘-fno-operator-names’ is valid for C++/ObjC++ but not for C [-Werror]
This appears to have caused macOS linker issues: chromium:1059196

Instead, explicitly add the flag to compile with warnings-as-errors
(when enabled) for code that is actively maintained by us, and make
Subzero's legacy LLVM dependencies a separate library compiled without
warnings-as-errors.

Also revert CMakeSettings.json changes that were inadvertently committed.

Bug: b/141361933
Bug: chromium:1059196
Change-Id: I27dd57d954a413a710613b0bfa2e69bd5242853a
Reviewed-on: https://swiftshader-review.googlesource.com/c/SwiftShader/+/41968Reviewed-by: Marc-Antoine Desroches <madesroches@google.com>
Reviewed-by: Nicolas Capens <nicolascapens@google.com>
Tested-by: Nicolas Capens <nicolascapens@google.com>
Kokoro-Presubmit: kokoro <noreply+kokoro@google.com>

On Windows placing the vulkan-1.dll next to the executables suffices for
them to load SwiftShader instead of the system's Vulkan ICD loader (if
present).

Also make warnings-as-errors only affect our own projects, and put
things into project folders.

Bug: b/141361933
Change-Id: Ibdf8bcb992aa484d4bebaaf52ae77a8ced61709a
Reviewed-on: https://swiftshader-review.googlesource.com/c/SwiftShader/+/40788
Presubmit-Ready: Nicolas Capens <nicolascapens@google.com>
Kokoro-Presubmit: kokoro <noreply+kokoro@google.com>
Tested-by: Nicolas Capens <nicolascapens@google.com>
Reviewed-by: Antonio Maiorano <amaiorano@google.com>

Implement non-optimized version. Should generalize and optimize code in
UShort4::UShort4(RValue<Float4> cast, bool saturate) so we can use it
here.

Bug: b/145754674
Change-Id: I16a24dab2979bb97d2d5f36a406aeb62aeb976e8
Reviewed-on: https://swiftshader-review.googlesource.com/c/SwiftShader/+/41928Tested-by: Antonio Maiorano <amaiorano@google.com>
Reviewed-by: Nicolas Capens <nicolascapens@google.com>

On x86-32/64, assume that loads and stores are atomic, and that
strictest memory order is supported.

Bug: b/150475088
Change-Id: I5f99a0309eca668d0c1197387bcf687b32381179
Reviewed-on: https://swiftshader-review.googlesource.com/c/SwiftShader/+/41790Tested-by: Antonio Maiorano <amaiorano@google.com>
Reviewed-by: Nicolas Capens <nicolascapens@google.com>
Kokoro-Presubmit: kokoro <noreply+kokoro@google.com>

CMake variables were renamed in
https://swiftshader-review.googlesource.com/c/SwiftShader/+/39909

This means regres has been running without DCHECK_ALWAYS_ON enabled,
possibly resulting in false positives when SwiftShader would assert.

Bug: n/a
Change-Id: Ifc4963a6c562bd21db9e1775e06dc5d4ff20f290
Reviewed-on: https://swiftshader-review.googlesource.com/c/SwiftShader/+/41908Reviewed-by: Nicolas Capens <nicolascapens@google.com>
Tested-by: Antonio Maiorano <amaiorano@google.com>

Regression was introduced in
https://swiftshader-review.googlesource.com/c/SwiftShader/+/41269

When detecting and removing intermediate stores, if the storeValue is a
constant, we skip it; however, we must make sure to set unmatchedLoads
to true, or the optimizer will incorrectly eliminate the skipped store
on a later iteration.

This bug lead to incorrect generated code, which failed certain deqp-vk
tests, e.g. dEQP-VK.clipping.user_defined.clip_cull_distance.vert.2_6

Bug: b/148272103
Change-Id: I024d75decdc4f1d13e7f82cade50f8be09d68f3e
Reviewed-on: https://swiftshader-review.googlesource.com/c/SwiftShader/+/41888Tested-by: Antonio Maiorano <amaiorano@google.com>
Kokoro-Presubmit: kokoro <noreply+kokoro@google.com>
Reviewed-by: Nicolas Capens <nicolascapens@google.com>

This fixes the Vulkan Loader for CMake builds.

Bug: b/150626933
Change-Id: I600597c95c4a41f3242028fd9ccd65fced4ead33
Reviewed-on: https://swiftshader-review.googlesource.com/c/SwiftShader/+/41848Reviewed-by: Nicolas Capens <nicolascapens@google.com>
Tested-by: James Price <jrprice@google.com>

Defines in BUILD.gn files don't apply transitively to dependencies, so
we have to repeat the SWIFTSHADER_ENABLE_ASTC for the Device
subdirectory.

Note we could also use 'public_configs = [:swiftshader_libvulkan_private_config]'
but this adds more defines and build flags than what we need. Since this
is intended as a temporary workaround anyway, we're keeping it simple.

Bug: b/150600814
Change-Id: Ib06f4a22559ee58114da5841e66e59bfce9aec4a
Reviewed-on: https://swiftshader-review.googlesource.com/c/SwiftShader/+/41868Tested-by: Nicolas Capens <nicolascapens@google.com>
Reviewed-by: Antonio Maiorano <amaiorano@google.com>

Change-Id: I05b0a9fbad99116a7163a6cb4ad43e7eccb060f3
Reviewed-on: https://swiftshader-review.googlesource.com/c/SwiftShader/+/41808
Kokoro-Presubmit: kokoro <noreply+kokoro@google.com>
Reviewed-by: Nicolas Capens <nicolascapens@google.com>
Reviewed-by: Antonio Maiorano <amaiorano@google.com>
Tested-by: Nicolas Capens <nicolascapens@google.com>

To temporarily work around build issues related to Google3 integration,
make ASTC support optional and only enable it for CMake, Chromium, and
Android builds.

Bug: b/150600814
Change-Id: Iac6a404322c65a6f2727807ea8af2edfb219a5a2
Reviewed-on: https://swiftshader-review.googlesource.com/c/SwiftShader/+/41828Tested-by: Nicolas Capens <nicolascapens@google.com>
Reviewed-by: Sean Risser <srisser@google.com>
Reviewed-by: Nicolas Capens <nicolascapens@google.com>

It's valid in Vulkan for a shader to have specialization constants
and the pipeline to be lacking specialization constant data. This
could lead to a key match between the two even though there should
be a different shader payload. From the spec:

> It is legal for a SPIR-V module with specializations to be
> compiled into a pipeline where no specialization info was provided.
> SPIR-V specialization constants contain default values such that
> if a specialization is not provided.

Fix this by adding in the required checks. Should not affect perf.

Bug: b/150449637
Bug: angleproject:4426
Change-Id: I5f384420bdc1f03a36852db0b20393ae56452b62
Reviewed-on: https://swiftshader-review.googlesource.com/c/SwiftShader/+/41728Tested-by: Nicolas Capens <nicolascapens@google.com>
Kokoro-Presubmit: Jamie Madill <jmadill@chromium.org>
Kokoro-Presubmit: kokoro <noreply+kokoro@google.com>
Reviewed-by: Nicolas Capens <nicolascapens@google.com>
Reviewed-by: Alexis Hétu <sugoi@google.com>

This cl adds both LDR and HDR support for ASTC compressed
textures. Only LDR formats are exposed in the
PhysicalDevice's properties, but HDR support can be added
trivially later by adding the HDR formats and exposing
"VK_EXT_texture_compression_astc_hdr".

Pulled from: https://github.com/ARM-software/astc-encoder
Git hash: 81a5e50741b4c8302cf7d78f314a53e44ee68e1f

The astc-encode git repo was added to third-party, with a
few minor modifications:
1) All encoding related code has been ripped out, only
   decoding related code remains
2) Replaced ASTC_CODEC_INTERNAL_ERROR() with UNREACHABLE()
   in a switch statement in astc_color_unquantize.cpp
3) Some functions were using a lot of stack memory, so I
   added a unique_ptr to allocate the same objects on the
   heap, to avoid potential issues.

LDR ASTC is decoded to 8bit unsigned RGBA.
HDR ASTC is decoded to 32b floating point.

Tests: dEQP-VK.*astc*
Bug: b/150130101
Change-Id: I6b03fed6e1f326a95c7aefe9f9a9d0a89cf24428
Reviewed-on: https://swiftshader-review.googlesource.com/c/SwiftShader/+/41568Reviewed-by: Nicolas Capens <nicolascapens@google.com>
Tested-by: Nicolas Capens <nicolascapens@google.com>
Kokoro-Presubmit: kokoro <noreply+kokoro@google.com>

EGL_ANGLE_iosurface_client_buffer added a new attribute to the config:
EGL_BIND_TO_TEXTURE_TARGET_ANGLE, which needed to be properly exposed
in the EGL frontend.

Bug: chromium:1015454
Change-Id: I58881df18d711ed7974a0a06e53fed42b1f28638
Reviewed-on: https://swiftshader-review.googlesource.com/c/SwiftShader/+/41709
Presubmit-Ready: Alexis Hétu <sugoi@google.com>
Kokoro-Presubmit: kokoro <noreply+kokoro@google.com>
Reviewed-by: Alexis Hétu <sugoi@google.com>
Reviewed-by: Nicolas Capens <nicolascapens@google.com>
Tested-by: Alexis Hétu <sugoi@google.com>

Set squash uploads to false. This should make git cl upload work
properly from SwiftShader for those who prefer that over 'git push'
to a ref.

Bug: None
Change-Id: Ib80fdbd28c2a7a5808ab73ceec8ddb98f8962e0b
Reviewed-on: https://swiftshader-review.googlesource.com/c/SwiftShader/+/41708Tested-by: Jamie Madill <jmadill@chromium.org>
Reviewed-by: Nicolas Capens <nicolascapens@google.com>
Kokoro-Presubmit: kokoro <noreply+kokoro@google.com>

For the System V ABI, variadic calls must store the number of floating
point arguments into RAX. This was mostly working by accident for
our calls to printf since RAX is used as a scratch register, and was
often non-zero, which is all that's really needed for printf with float
args to work; however, when RAX would become 0, printf would print the
wrong thing.

Bug: b/149913889
Change-Id: Id4b519c5416927d537fca078109c0dc850f08359
Reviewed-on: https://swiftshader-review.googlesource.com/c/SwiftShader/+/41668Tested-by: Antonio Maiorano <amaiorano@google.com>
Kokoro-Presubmit: kokoro <noreply+kokoro@google.com>
Reviewed-by: Nicolas Capens <nicolascapens@google.com>

The code in VkPipelineCache was correctly comparing all the attributes
of the specialization constants and then was also doing a faulty shared
pointer comparison. This was causing major drag on draw calls as every
draw call in ANGLE was recompiling the shader.

Bug: angleproject:4426
Change-Id: Ia0466738eb7de78c0c3b53e61e2f2bc6831bbcca
Reviewed-on: https://swiftshader-review.googlesource.com/c/SwiftShader/+/41688
Kokoro-Presubmit: Jamie Madill <jmadill@chromium.org>
Reviewed-by: Nicolas Capens <nicolascapens@google.com>
Tested-by: Nicolas Capens <nicolascapens@google.com>

If the stack size is > 4K, emit chkstk, which probes the stack to commit
the pages required to support the large stack.

Bug: swiftshader:25
Change-Id: I6b9f09218736ffb641cb1dbf95a1de7149633ef8
Reviewed-on: https://swiftshader-review.googlesource.com/c/SwiftShader/+/41608
Presubmit-Ready: Antonio Maiorano <amaiorano@google.com>
Reviewed-by: Nicolas Capens <nicolascapens@google.com>
Kokoro-Presubmit: kokoro <noreply+kokoro@google.com>
Tested-by: Antonio Maiorano <amaiorano@google.com>

The CMake build was already using -fvisibility=protected, which has the
same effect but uses duplicate symbol entries for internal/external use.

Bug: b/148240133
Change-Id: I8069a1b293a6ec0604be32179ed591ffaa645ed7
Reviewed-on: https://swiftshader-review.googlesource.com/c/SwiftShader/+/41648
Presubmit-Ready: Nicolas Capens <nicolascapens@google.com>
Tested-by: Nicolas Capens <nicolascapens@google.com>
Reviewed-by: Antonio Maiorano <amaiorano@google.com>

Referencing //third_party/SPIRV-Tools directly only works when building
inside a Chromium checkout.

Bug: angleproject:4425
Change-Id: I70ace58145a93b747a67d98b6efd4af7e3cfd370
Reviewed-on: https://swiftshader-review.googlesource.com/c/SwiftShader/+/41628Tested-by: Nicolas Capens <nicolascapens@google.com>
Reviewed-by: Alexis Hétu <sugoi@google.com>

Bug: angleproject:4425
Change-Id: I2785b9f5c6f96b2b12eeacf64ff5316355f1ae54
Reviewed-on: https://swiftshader-review.googlesource.com/c/SwiftShader/+/41609Tested-by: Nicolas Capens <nicolascapens@google.com>
Reviewed-by: Chris Forbes <chrisforbes@google.com>

Currently we produce a warning every time an unsupported extension is
used. The original bug (b/139528538) called for logging these structs
silently unless a debugger's attached.

So I've replaced all of our warnings for unsupported structs with
calls to LOG_TRAP. This is an update to TRACE_ASSERT. LOG_TRAP will
never emit to the debug log, instead it will only print to a file if
writing to files is enabled for logv.

Bug: b/148415347
Change-Id: Ib4ad2b20b3dffce4fac597c891b2f5ee23e032c4
Reviewed-on: https://swiftshader-review.googlesource.com/c/SwiftShader/+/41348Tested-by: Sean Risser <srisser@google.com>
Presubmit-Ready: Sean Risser <srisser@google.com>
Kokoro-Presubmit: kokoro <noreply+kokoro@google.com>
Reviewed-by: Nicolas Capens <nicolascapens@google.com>

Change-Id: Id5607e9329a01bcc137cd2f9c25db798dab15a4a
Reviewed-on: https://swiftshader-review.googlesource.com/c/SwiftShader/+/41488
Kokoro-Presubmit: kokoro <noreply+kokoro@google.com>
Reviewed-by: Nicolas Capens <nicolascapens@google.com>
Reviewed-by: Antonio Maiorano <amaiorano@google.com>
Tested-by: Nicolas Capens <nicolascapens@google.com>

And remove external SPIRV-Headers dependency. We use an internal copy.

Bug: angleproject:4425
Change-Id: I36c8c836197d6642d4c696520d61bdf7790fce6c
Reviewed-on: https://swiftshader-review.googlesource.com/c/SwiftShader/+/41589Tested-by: Nicolas Capens <nicolascapens@google.com>
Reviewed-by: Nicolas Capens <nicolascapens@google.com>

Will be used by SpirvShaderEnumNames.cpp in https://swiftshader-review.googlesource.com/c/SwiftShader/+/41510

Bug: angleproject:4425
Change-Id: I631c593432c12a6ccf64edcb83b2e11ac87104c0
Reviewed-on: https://swiftshader-review.googlesource.com/c/SwiftShader/+/41588Tested-by: Nicolas Capens <nicolascapens@google.com>
Reviewed-by: Alexis Hétu <sugoi@google.com>

Also applies a fix for `spvOpcodeString` being moved to the public spirv-tools interface.

Changes:
    8910ea5f1 Fix Wrange-loop-analysis warnings in SPIRV-Tools. (#3201)
    c316fb15f Add missing dependencies when generating spvtools_core_tables (#3199)
    03c9effb5 Brief guide to writing a spirv-fuzz fuzzer pass (#3190)
    dea1040fa Fix ignored const qualifier warning in static_cast (#3197)
    4a80497a8 Make spvOpcodeString part of the public API (#3174)
    03794b8f5 Fix static libraries linking order (#3189)
    79f8caf91 vscode: Add missing fields to schema.Opcode (#3169)
    4d912f4e6 spirv-val: Add support for SPV_AMD_shader_image_load_store_lod (#3186)
    77fefe765 spirvfuzz: Fix type-related bug, change undef to zero, and add assert (#3188)
    6c218ec60 spirv-fuzz: Fuzzer pass that adds access chains (#3182)
    77fb303e5 spirv-fuzz: Fuzzer pass to add function calls (#3178)
    3d4a0dd48 spirv-fuzz: Ensure that donated variables are always initialized (#3181)
    fe10239f9 spirv-fuzz: Add fuzzer passes to add loads/stores (#3176)
    1f03ac102 spirv-fuzz: Fuzzer passes to add local and global variables (#3175)
    9e52bc0d0 utils/vscode: LSP - Support OpExtInst (#3140)
    a3b5ad909 Fix typos in opt's help. Update environment version. (#3170)
    da5457f6b Start SPIRV-Tools v2020.2
    8dd174809 Finalize SPIRV-Tools v2020.1
    76616bab6 Update CHANGES
    bb56e892f spirv-fuzz: Fuzzer pass to add composite types (#3171)
    fdd0c8776 Update script that checks copyright years. (#3173)
    b7e0998e3 spirv-fuzz: Disallow copying of null and undefined pointers (#3172)
    a9624b4d5 Handle TimeAMD in AmdExtensionToKhrPass. (#3168)
    ddcc11763 Update CHANGES
    0265a9d4d Implement constant folding for many transcendentals (#3166)
    7a2d408de Fix typo in comment. (#3163)
    1fc7a9ec7 spirv-fuzz: Arbitrary variable facts (#3165)
    dd3f8d492 spirv-fuzz: Add outlining test (#3164)
    521223b70 spirv-fuzz: Make functions "livesafe" during donation (#3146)
    97f1d485b Dead branch elim fix (#3160)
    1b3441036 Fix chromium build (#3152)
    5d786f6cc Clarify mapping of target env to SPIR-V version (#3150)
    e7afeb060 Use dummy switch instead of dummy loop in MergeReturn pass. (#3151)
    6729c4a7c Fix structured exit validation (#3141)
    bb236c326 Add spvParseVulkanEnv (#3142)
    dd37d73c5 Handle conflict between debug info and existing validation rule (#3104)
    b97057e7f Use spirv-headers' BUILD.gn (#3148)
    6a1a1b326 Roll external/spirv-headers/ af64a9e82..dc77030ac (4 commits) (#3147)
    ab7ac60f1 spirv-fuzz: Refactoring and type-related fixes (#3144)
    323a81fc5 Validate Vulkan 1.2 capabilities
    d46a1b048 Add basic support for Vulkan 1.2: SPV_ENV_VULKAN_1_2
    f8d7df760 Fix OpLine bug of merge-blocks pass (#3130)
    8013d477a spirv-fuzz: add dead blocks (#3135)
    18b3b9456 Remove names and decorations of imported symbols (#3081)
    fb2e81981 Fix GN build for OpenCL.DebugInfo.100 update (#3134)
    c86dc0bcd Fix bad parameter names in error message (#3129)
    899735f45 Revert PR #3093 (#3131)
    a466b99db Disallow forward references in arrays (#3093)
    31acc7882 spirv-fuzz: Add fuzzer pass to perform module donation (#3117)
    c8bf14393 GetOperandConstants operand can be const (#3126)

Commands:
    git subtree pull --prefix third_party/SPIRV-Tools https://github.com/KhronosGroup/SPIRV-Tools master --squash

Bug: b/123642959
Bug: angleproject:4425
Change-Id: I73076a22b474893d900a017d94a5d122061381bc

8910ea5f1 Fix Wrange-loop-analysis warnings in SPIRV-Tools. (#3201)
c316fb15f Add missing dependencies when generating spvtools_core_tables (#3199)
03c9effb5 Brief guide to writing a spirv-fuzz fuzzer pass (#3190)
dea1040fa Fix ignored const qualifier warning in static_cast (#3197)
4a80497a8 Make spvOpcodeString part of the public API (#3174)
03794b8f5 Fix static libraries linking order (#3189)
79f8caf91 vscode: Add missing fields to schema.Opcode (#3169)
4d912f4e6 spirv-val: Add support for SPV_AMD_shader_image_load_store_lod (#3186)
77fefe765 spirvfuzz: Fix type-related bug, change undef to zero, and add assert (#3188)
6c218ec60 spirv-fuzz: Fuzzer pass that adds access chains (#3182)
77fb303e5 spirv-fuzz: Fuzzer pass to add function calls (#3178)
3d4a0dd48 spirv-fuzz: Ensure that donated variables are always initialized (#3181)
fe10239f9 spirv-fuzz: Add fuzzer passes to add loads/stores (#3176)
1f03ac102 spirv-fuzz: Fuzzer passes to add local and global variables (#3175)
9e52bc0d0 utils/vscode: LSP - Support OpExtInst (#3140)
a3b5ad909 Fix typos in opt's help. Update environment version. (#3170)
da5457f6b Start SPIRV-Tools v2020.2
8dd174809 Finalize SPIRV-Tools v2020.1
76616bab6 Update CHANGES
bb56e892f spirv-fuzz: Fuzzer pass to add composite types (#3171)
fdd0c8776 Update script that checks copyright years. (#3173)
b7e0998e3 spirv-fuzz: Disallow copying of null and undefined pointers (#3172)
a9624b4d5 Handle TimeAMD in AmdExtensionToKhrPass. (#3168)
ddcc11763 Update CHANGES
0265a9d4d Implement constant folding for many transcendentals (#3166)
7a2d408de Fix typo in comment. (#3163)
1fc7a9ec7 spirv-fuzz: Arbitrary variable facts (#3165)
dd3f8d492 spirv-fuzz: Add outlining test (#3164)
521223b70 spirv-fuzz: Make functions "livesafe" during donation (#3146)
97f1d485b Dead branch elim fix (#3160)
1b3441036 Fix chromium build (#3152)
5d786f6cc Clarify mapping of target env to SPIR-V version (#3150)
e7afeb060 Use dummy switch instead of dummy loop in MergeReturn pass. (#3151)
6729c4a7c Fix structured exit validation (#3141)
bb236c326 Add spvParseVulkanEnv (#3142)
dd37d73c5 Handle conflict between debug info and existing validation rule (#3104)
b97057e7f Use spirv-headers' BUILD.gn (#3148)
6a1a1b326 Roll external/spirv-headers/ af64a9e82..dc77030ac (4 commits) (#3147)
ab7ac60f1 spirv-fuzz: Refactoring and type-related fixes (#3144)
323a81fc5 Validate Vulkan 1.2 capabilities
d46a1b048 Add basic support for Vulkan 1.2: SPV_ENV_VULKAN_1_2
f8d7df760 Fix OpLine bug of merge-blocks pass (#3130)
8013d477a spirv-fuzz: add dead blocks (#3135)
18b3b9456 Remove names and decorations of imported symbols (#3081)
fb2e81981 Fix GN build for OpenCL.DebugInfo.100 update (#3134)
c86dc0bcd Fix bad parameter names in error message (#3129)
899735f45 Revert PR #3093 (#3131)
a466b99db Disallow forward references in arrays (#3093)
31acc7882 spirv-fuzz: Add fuzzer pass to perform module donation (#3117)
c8bf14393 GetOperandConstants operand can be const (#3126)

git-subtree-dir: third_party/SPIRV-Tools
git-subtree-split: 8910ea5f1c7bc38f79a8b70b265cd9d1571f4b56

Bug: chromium:1039697
Change-Id: I5af47f44696a0eb1da7516ea57f3ae766651cae3
Reviewed-on: https://swiftshader-review.googlesource.com/c/SwiftShader/+/41548
Presubmit-Ready: Nico Weber <thakis@chromium.org>
Kokoro-Presubmit: kokoro <noreply+kokoro@google.com>
Reviewed-by: Nicolas Capens <nicolascapens@google.com>
Tested-by: Nicolas Capens <nicolascapens@google.com>

A recent change was made that failed when building nacl, because despite
the target_cpu being set to x86, current_cpu is x64 for nacl, as it is
cross-compiled to x64 using a different toolchain. As such, we were
building and linking the x86 version of Subzero with the x64 version of
nacl, resulting in a linker error.

See the following doc for more info:
https://chromium.googlesource.com/dart/dartium/src/+/refs/heads/master/tools/gn/docs/cross_compiles.md#as-a-build_gn-author

Bug: b/150008309
Change-Id: I581538cb7bb090e5b30819052eb7e245bc90ab12
Reviewed-on: https://swiftshader-review.googlesource.com/c/SwiftShader/+/41528Reviewed-by: Nicolas Capens <nicolascapens@google.com>
Tested-by: Antonio Maiorano <amaiorano@google.com>

This reverts commit f50cc82b.

Reason for revert: Skia roll broken. See:
https://chromium-review.googlesource.com/c/chromium/src/+/2067664
"lld-link: error: undefined symbol: _chkstk"

Change-Id: I2ac508c9560e3a49e8a856906c3a5f6141c45207
Reviewed-on: https://swiftshader-review.googlesource.com/c/SwiftShader/+/41489Reviewed-by: Antonio Maiorano <amaiorano@google.com>
Tested-by: Alexis Hétu <sugoi@google.com>