[HLSL] Add support for NonUniformResourceIndex

[hekota]

Add support for NonUniformResourceIndex - a qualifier on a resource array index that indicates the index in not uniform across threads.

https://learn.microsoft.com/en-us/windows/win32/direct3d12/resource-binding-in-hlsl

This could be done by adding NonUniformResourceIndex function to hlsl.h that would call a builtin function __builtin_hlsl_resource_nonuniformindex. The builtin would be translated to an LLVM intrinsic llvm.{dx|svp}.resource.nonuniformindex.

During DXIL lowering the intrinsic will be translated to the NonUniform parameter on create handle DXIL ops (#155701).

Depends on #155701

[llvmbot]

@llvm/issue-subscribers-clang-codegen

Author: Helena Kotas (hekota)

Add support for `NonUniformResourceIndex` - a qualifier on a resource array index that indicates the index in not uniform across threads.

https://learn.microsoft.com/en-us/windows/win32/direct3d12/resource-binding-in-hlsl

This could be done by adding NonUniformResourceIndex function to hlsl.h that would call a builtin function __builtin_hlsl_resource_nonuniformindex. The builtin would be translated to an LLVM intrinsic llvm.{dx|svp}.resource.nonuniformindex.

During DXIL lowering the intrinsic will be translated to the NonUniform parameter on create handle DXIL ops (#155701).

Depends on #155701