Merge pull request #558 from steve-lunarg/image-atomics

HLSL: phase 4 of RWTexture support: add image atomics

diff --cc gtests/Hlsl.FromFile.cpp
index 9c1a3ee,7891342..0291b04
--- 1/gtests/Hlsl.FromFile.cpp
--- 2/gtests/Hlsl.FromFile.cpp
+++ b/gtests/Hlsl.FromFile.cpp
@@@ -151,8 -149,8 +151,9 @@@ INSTANTIATE_TEST_CASE_P
          {"hlsl.overload.frag", "PixelShaderFunction"},
          {"hlsl.pp.line.frag", "main"},
          {"hlsl.precise.frag", "main"},
 +        {"hlsl.promote.binary.frag", "main"},
          {"hlsl.promotions.frag", "main"},
+         {"hlsl.rw.atomics.frag", "main"},
          {"hlsl.rw.bracket.frag", "main"},
          {"hlsl.rw.scalar.bracket.frag", "main"},
          {"hlsl.rw.vec2.bracket.frag", "main"},