[clang] [HLSL] Make HLSLAttributedResourceType canonical and add code paths to convert HLSL types to DirectX target types (PR #110327)

[Justin Bogner via cfe-commits]

https://github.com/bogner commented:

This LGTM but I'm not familiar enough with the mangling aspects or the implications of adding a canonical type to be comfortable signing off on it.

https://github.com/llvm/llvm-project/pull/110327