[clang] [HLSL] Implement `SpirvType` and `SpirvOpaqueType` (PR #134034)

[Steven Perron via cfe-commits]

https://github.com/s-perron commented:

I've done some extra testing and playing with it. It seems to be working. However, I do not know enough about how things are done in clang to know if this is the best way to do it. It look reasonable to me. Others will have to review the implementation.

https://github.com/llvm/llvm-project/pull/134034