[llvm] [SPIRV][HLSL] Add HLSL intrinsic tests (PR #86844)

[Cooper Partin via llvm-commits]

https://github.com/coopp approved this pull request.

Looks good to me.  I'll second Justin's comment about finding someone with SPIR-V knowledge to peek as well. 

https://github.com/llvm/llvm-project/pull/86844