Merge pull request #2468 from KhronosGroup/bfloat16

Implement GL_EXT_bfloat16

Merge pull request #2449 from KhronosGroup/glsl-atomic-fixes

GLSL: Fix some issues with atomics

Merge pull request #2429 from KhronosGroup/fix-2411

HLSL: Fix lowering of arrayed clip/cull distance in mesh shaders.

Merge pull request #2429 from KhronosGroup/fix-2411

HLSL: Fix lowering of arrayed clip/cull distance in mesh shaders.

Merge pull request #2379 from etang-cw/TexAtomicRecompile

Reduce recompile count with texture atomics

Merge pull request #2344 from billhollings/gather-constoffsts-arg-buffs

MSL: Image gather ConstOffsets supports multiple address spaces.

Merge pull request #2317 from KhronosGroup/fix-2309

MSL: Handle missing FP16 trancendental overloads.

Merge pull request #2290 from KhronosGroup/fix-2287

MSL: Fix type hierarchy for extended vectors.

Merge pull request #2255 from KhronosGroup/pr-2247

HLSL: Fix issue with vec4 straddle rules in substructs.

Merge pull request #2218 from KhronosGroup/pr-2217

Merge PR 2217