[HLSL] Support NonUniformResourceIndex

[llvm-beanz]

When indexing into resource arrays with non-uniform indices you need to use the NonUniformResourceIndex intrinsic to ensure that the resource indies are communicated to the driver as non-uniform.

Several of the tests we've added in the offload test suite require this annotation for correctness.

[hekota]

Duplicate of #157923 and #155701.