* Generate ext inst table for reflection
* Change build to use grammar files from SPIRV-Headers instead of
  SPIRV-Tools
* Add enum for clspv reflection extended instruction set
  * count it as non-semantic
* validate clspv reflection extended instruction set
* Remove local extended inst sets
* update headers deps
* Update nbuilds to use grammars from SPIRV-Headers instead of
  local duplicates

Roll third_party/glslang/ 3ee5f2f..b60e067 (8 commits)

KhronosGroup/glslang@3ee5f2f...b60e067

$ git log 3ee5f2f..b60e067 --date=short --no-merges --format='%ad %ae %s'
2020-08-06 john SPV: Fix KhronosGroup#1829: don't emit OpModuleProcessed use-storage-buffer
2020-08-05 john Build/Test: Dropping 2013 allows using the latest googletests.
2020-08-04 john SPV: Standalone; sanity check the client GLSL input semantics option value.
2020-08-04 john SPV: Use more correct SPV-Tools environment, partially addressing KhronosGroup#2290
2020-08-04 john SPV: Fix KhronosGroup#2363: include trailing newline named text SPV output.
2020-07-03 ShabbyX Use GLSLANG_ANGLE to strip features to what ANGLE requires
2020-07-31 bclayton Revert changes that migrate to `thread_local`.
2020-07-27 dneto Avoid spurious warning about uninit var

Created with:
  roll-dep third_party/glslang

Roll third_party/googletest/ a781fe29b..3af06fe16 (12 commits)

google/googletest@a781fe2...3af06fe

$ git log a781fe29b..3af06fe16 --date=short --no-merges --format='%ad %ae %s'
2020-08-05 absl-team Googletest export
2020-08-03 absl-team Googletest export
2020-08-03 absl-team Googletest export
2020-08-05 zumix.cpp fix endif comment
2020-08-02 zumix.cpp fix tests
2020-07-29 franciscogthiesen Removing tiny-dnn from "Who is using.."
2020-07-28 absl-team Googletest export
2020-07-29 zumix.cpp fix GTEST_REMOVE_LEGACY_TEST_CASEAPI_ typo
2020-07-28 absl-team Googletest export
2020-07-26 ofats Googletest export
2020-07-19 jasjuang fix clang tidy modernize-use-equals-default warnings
2020-07-02 siliconearth Fix test failing when simple regex is used

Created with:
  roll-dep third_party/googletest

Roll third_party/spirv-cross/ 0376576d2..82d1c43e4 (7 commits)

KhronosGroup/SPIRV-Cross@0376576...82d1c43

$ git log 0376576d2..82d1c43e4 --date=short --no-merges --format='%ad %ae %s'
2020-08-03 cdavis MSL: Fix handling of matrices and structs in the output control point array.
2020-07-29 post Add some test cases for complex type aliasing scenario.
2020-07-29 post Ensure that we use primary alias type when emitting flattened members.
2020-07-29 post GLSL: Be more aggressive about using type_alias.
2020-07-29 post Only rewrite type aliases for the base type.
2020-07-28 post GLSL: Add option to force flattening IO blocks.
2020-07-23 tommek Adding BuiltInSampleMask in HLSL

Created with:
  roll-dep third_party/spirv-cross

Roll third_party/spirv-headers/ 979924c..3fdabd0 (4 commits)

KhronosGroup/SPIRV-Headers@979924c...3fdabd0

$ git log 979924c..3fdabd0 --date=short --no-merges --format='%ad %ae %s'
2020-08-03 44190824+mmerecki Reserve SPIR-V token range for upcoming Intel extensions. (KhronosGroup#165)
2020-07-29 alanbaker Update BUILD.bazel and BUILD.gn (KhronosGroup#166)
2020-07-29 alanbaker Publish the headers for the clspv embedded reflection non-semantic extended instruction set (KhronosGroup#164)
2020-07-29 johnkslang Update the registry in spir-v.xml to modernize and split out opcodes. (KhronosGroup#156)

Created with:
  roll-dep third_party/spirv-headers

Roll third_party/spirv-tools/ b63f0e5..2990a21 (30 commits)

KhronosGroup/SPIRV-Tools@b63f0e5...2990a21

$ git log b63f0e5..2990a21 --date=short --no-merges --format='%ad %ae %s'
2020-08-10 stevenperron Avoid using /MP4 for clang on windows. (KhronosGroup#3662)
2020-08-06 antonikarp spirv-fuzz: TransformationReplaceAddSubMulWithCarryingExtended (KhronosGroup#3598)
2020-08-06 andreperezmaselco.developer spirv-fuzz: Add TransformationMakeVectorOperationDynamic (KhronosGroup#3597)
2020-08-06 andreperezmaselco.developer spirv-fuzz: iterate over blocks in replace linear algebra pass (KhronosGroup#3654)
2020-08-06 stefanomil spirv-fuzz: make outliner pass use additional transformations (KhronosGroup#3604)
2020-08-05 jaebaek OpenCL.DebugInfo.100 DebugTypeArray with variable size (KhronosGroup#3549)
2020-08-05 andreperezmaselco.developer spirv-opt: Improve the code of the Instruction class (KhronosGroup#3610)
2020-08-05 vasniktel spirv-fuzz: Handle OpPhis in livesafe functions (KhronosGroup#3642)
2020-08-05 vasniktel spirv-fuzz: Handle OpPhi during constant obfuscation (KhronosGroup#3640)
2020-08-05 vasniktel spirv-fuzz: Fix FuzzerPassCopyObjects (KhronosGroup#3638)
2020-08-04 vasniktel spirv-fuzz: Remove OpFunctionCall operands in correct order (KhronosGroup#3630)
2020-08-04 vasniktel spirv-fuzz: Handle capabilities during module donation (KhronosGroup#3651)
2020-08-04 vasniktel spirv-fuzz: Refactor boilerplate in TransformationAddParameter (KhronosGroup#3625)
2020-08-03 vasniktel spirv-fuzz: TransformationMoveInstructionDown (KhronosGroup#3477)
2020-07-31 jaebaek Remove DebugDeclare only for target variables in ssa-rewrite (KhronosGroup#3511)
2020-07-31 vasniktel Fix typo in ASAN CI build (KhronosGroup#3623)
2020-07-30 stefanomil spirv-fuzz: Transformation to add loop preheader (KhronosGroup#3599)
2020-07-30 stefanomil spirv-fuzz: Pass to replace int operands with ints of opposite signedness (KhronosGroup#3612)
2020-07-30 jaebaek Debug info preservation in loop-unroll pass (KhronosGroup#3548)
2020-07-30 alanbaker Validator support for non-semantic clspv reflection (KhronosGroup#3618)
2020-07-30 vasniktel spirv-fuzz: Fix memory bugs (KhronosGroup#3622)
2020-07-29 andreperezmaselco.developer spirv-fuzz: Implement the OpOuterProduct linear algebra case (KhronosGroup#3617)
2020-07-30 vasniktel spirv-fuzz: Compute corollary facts from OpBitcast (KhronosGroup#3538)
2020-07-29 dj2 Update some language usage. (KhronosGroup#3611)
2020-07-29 vasniktel spirv-fuzz: Relax type constraints in DataSynonym facts (KhronosGroup#3602)
2020-07-29 vasniktel spirv-fuzz: Remove non-deterministic behaviour (KhronosGroup#3608)
2020-07-29 afdx Avoid use of 'sanity' and 'sanity check' in the code base (KhronosGroup#3585)
2020-07-27 andreperezmaselco.developer spirv-fuzz: Add condition to make functions livesafe (KhronosGroup#3587)
2020-07-27 rharrison Rolling 4 dependencies (KhronosGroup#3601)
2020-07-27 andreperezmaselco.developer spirv-fuzz: Implement the OpTranspose linear algebra case (KhronosGroup#3589)

Created with:
  roll-dep third_party/spirv-tools