[llvm] [DirectX][DXIL] Design document for TableGen Spec of DXIL Operations (PR #85170)

[Chris B via llvm-commits]

https://github.com/llvm-beanz commented:

My only suggested change here is to create DXIL Sub-Architectures to represent DXIL versions (SPIR-V does this already), then we can key DXIL.td off the DXIL version instead of the shader model version.

@bogner & @farzonl, do either of you have any feedback on this?

https://github.com/llvm/llvm-project/pull/85170