HLSL: Fix ordering defect if global SB decl after fn param

This change propagates the storage qualifier from the buffer object to its contained
array type so that isStructBufferType() realizes it is one.  That propagation was
happening before only for global variable declarations, so compilation defects would
result if the use of a function parameter happened before a global declaration.

This fixes that case, whether or not there ever is a global declaration, and
regardless of the relative order.

This changes the hlsl.structbuffer.fn.frag test to exercise the alternate order.

There are no differences to generated SPIR-V for the cases which successfully compiled before.

Rename KHX_multiview/device_group to EXT_multiview/device to match the released specs

GL_KHX_multiview and GL_KHX_device_group don't exist,
they were released as GL_EXT_multiview and GL_EXT_device_group.

More build fixes

Fix another build warning on some platforms

Use an explicit cast from size_t to int to avoid warning.

Sanitize ShaderLang.h

Fix build warnings on some platforms

Use an explicit cast from size_t to int to avoid errors like the following:
glslang\glslang\MachineIndependent\preprocessor\Pp.cpp(1053) : error C2220: warning treated as error - no 'object' file generated
glslang\glslang\MachineIndependent\preprocessor\Pp.cpp(1053) : warning C4267: '=' : conversion from 'size_t' to 'int', possible loss of data

affects Pp.cpp, hlslParseHelper.cpp.

Initialize local variable to get rid of warningsa about potentially
uninitialized variables:
glslang\hlsl\hlslparsehelper.cpp(3667) : error C2220: warning treated as error - no 'object' file generated
glslang\hlsl\hlslparsehelper.cpp(3667) : warning C4701: potentially uninitialized local variable 'builtIn' used

affects hlslParseHelper.cpp

ShaderLang.h contains declaration for `ShLink` function which is never
defined.

See this grep output:

$grep -Hrn 'ShLink'
glslang/Public/ShaderLang.h:206:SH_IMPORT_EXPORT int ShLink(
glslang/Public/ShaderLang.h:214:SH_IMPORT_EXPORT int ShLinkExt(
glslang/MachineIndependent/ShaderLang.cpp:1268:int ShLinkExt(

HLSL: small fix for index type in f16tof32 opcode

The f16tof32 opcode was indexing a vector with a float 0, rather
than an int 0.  It may have made no functional difference due to the
identical bit pattern, but code looking at the type could be
confused.

HLSL: add structuredbuffer pass by reference in fn params

HLSL: add f16tof32 and f32tof16 decompositions.

These correspond to SPV_KHR_device_group and SPV_KHR_multiview.
Also, bring tests up to date with Khronos internals, and some misc. related changes.

This PR adds the ability to pass structuredbuffer types by reference
as function parameters.

It also changes the representation of structuredbuffers from anonymous
blocks with named members, to named blocks with pseudonymous members.
That should not be an externally visible change.

Add reflection queries for thread local size.  Add ssbo auto-binding.

SPV: Unexpected declarations of capabilities from NV extensions.

New command line option --shift-ssbo-binding mirrors --shift-ubo-binding, etc.

New reflection query getLocalSize(int dim) queries local size, e.g, CS threads.

HLSL: implement 4 (of 6) structuredbuffer types

This is a partial implemention of structurebuffers supporting:

* structured buffer types of:
*   StructuredBuffer
*   RWStructuredBuffer
*   ByteAddressBuffer
*   RWByteAddressBuffer

* Atomic operations on RWByteAddressBuffer

* Load/Load[234], Store/Store[234], GetDimensions methods (where allowed by type)

* globallycoherent flag

But NOT yet supporting:

* AppendStructuredBuffer / ConsumeStructuredBuffer types
* IncrementCounter/DecrementCounter methods

Please note: the stride returned by GetDimensions is as calculated by glslang for std430,
and may not match other environments in all cases.

Add override where needed by clang++

Otherwise we get an error when we have both
-Werror and -Winconsistent-missing-override.
This is required for building with NDK r14 betas