Update known good SPIRV tools and headers

* Fixes use of optimizer
* Updated test outputs
 * GeometryStreams and TransformFeedback no longer fail validation

GLSL: Fix #1591: Require the id in subgroupBroadcast to be constant.

Update to newer SPIRV-Tools, including VK_EXT_scalar_block_layout

Validator has more refined messages about what kind of block layout
rules have been applied.

Merge branch 'scalar_block_layout' of https://github.com/jeffbolznv/glslang into jeffbolznv-scalar_block_layout

[HLSL/Spir-V] fix for incorrect spir-v on int dot(int, int)

Decomposes OpDot into corresponding multiplies and additions.

HLSL: implemented c register handling

HLSL: fix invalid spir-v vector * scalar for float1

Updated type conversion rules for HLSL frontend

Missing check for float results in always emitting OpIMul even for float types

Adjusted a test not to use c register for
a structured buffer, they are supposed to
use t registers

Added comments with hints for what are the
register types are used for.

Handle potentially uninitialized result

PCH filename depends on current binary dir

Fixes #1572

Fix parser issue: redeclare gl_FragStencilRefARB is not supported

Apinheiro/xfb struct assignment

Add DeadBranchElim before MergeReturn in legalization.

MergeReturn now requires this or could throw an error.

Rename PCH macro to glslang_pch (to avoid name collision) and update to latest spirv-tools

Use precompiled headers for some glslang projects (MSVC-only)