This PR primarily fixes the version-checking logic of the shader flags
`ResMayNotAlias` and `Max64UAVs` to correctly match DXC's behavior.
Primary changes:
- The logic for determining the presence of UAVs for the
`ResMayNotAlias` shader flag checked against the DXIL Version when it
should have been checking against the DXIL Validator Version. (See DXC:
[DxilShaderFlags.cpp#L484](f19b5da541/lib/DXIL/DxilShaderFlags.cpp (L484)))
- The logic for counting UAVs for the `Max64UAVs` shader flag checked
against the DXIL Version when it should have been checking against the
DXIL Validator Version. (See DXC:
[DxilModule.cpp#L327](f19b5da541/lib/DXIL/DxilModule.cpp (L327)))
- Tests have been modified to test the corrected behaviors for these two
flags
Additional changes included for consistency:
- The logic for setting `UseNativeLowPrecision` now checks against
Shader Model version instead of DXIL version to be consistent with the
code comments from DXC
([DxilShaderFlags.h#L280](f19b5da541/include/dxc/DXIL/DxilShaderFlags.h (L280))).
- An additional test has been added to ensure that the module flag
"dx.nativelowprec" set to 0 does not apply the `UseNativeLowPrecision`
shader flag
- Related shader flag tests were renamed to be more consistent, and some
comments were edited for clarification
- Add obj2yaml tests for the `Max64UAVs` shader flag
3e4e365fac