Allow subpassLoad for ANGLE

Find python interpreter from host when cross-compiling

Signed-off-by: Shahbaz Youssefi <ShabbyX@gmail.com>

Error when initializing rayQuery with assignment

Parser: Fix wrong names of extension macros

SPIRV: Fix some disassembly issues

- OpExecutionModeId is not supported in disassembly.
- Some execution modes are missing in disassembled strings.

The names of some extension macros are wrong because of coding typos.

Suppress two override suggestion warnings.

We're turning these on in ANGLE and want to keep the build clean.

This reverts commit f257e0ea, reversing
changes made to 8f0c6bd7.

Obey ENABLE_PCH CMake option

Use --test-root to pass files to Bazel tests.

GLSLANG_EXPORT for C APIs.

The current implementation makes tests fail when it is imported from a
different Bazel workspace. We fix that by using
the --test-root flag to pass the rootpath to the
tests.

Remove incorrect style of extension-based semantic checking.

We need separate concepts for
 - total set of extensions ever enabled, for the back end
 - current state of extensions, for parsing
 - the set of features currently enabled for building the AST

This detangles incorrect conflation of HLSL with GLSL extensions,
defers asking expensive questions until it's time to ask, and removes
some dead code.

The scalar type was already the basic type passed in.

Also factored out of this the checking of extensions for 8/16-bit stuff.
This code seems wrong in several ways, but for now just documenting it.

Update tools

Fixes FFI breakage introduced in #2283

See #2366 for detail.

Build/Test: Dropping VS 2013 allows using the latest googletests

These have a new spelling: INSTANTIATE_TEST_CASE_P -> INSTANTIATE_TEST_SUITE_P

Use GLSLANG_ANGLE to strip features to what ANGLE requires

Revert changes that migrate to `thread_local`.

This change strips a few features similar to GLSLANG_WEB but doesn't
remove every detail like the latter.  It also hardcodes profile/version
to core/450.

In particular, TBuiltIns::initialize is specialized to remove most of
what is not supported or won't be supported by ANGLE.  The result of
this function is parsed with TParseContext::parseShaderStrings which is
a performance bottleneck.

This change shaves about 300KB off of ANGLE's binary size and reduces
the cost of SetupBuiltinSymbolTable to nearly a sixth.
Signed-off-by: Shahbaz Youssefi <ShabbyX@gmail.com>