[mlir] [clang] [llvm] [AMDGPU] Add GFX12 WMMA and SWMMAC instructions (PR #77795)

[Jay Foad via cfe-commits]

jayfoad wrote:

> Also need to be updated:
> 
> https://github.com/llvm/llvm-project/blob/bb6a4850553dd4140a5bd63187ec1b14d0b731f9/llvm/lib/Target/AMDGPU/SMInstructions.td#L14

What needs to be updated and why?

https://github.com/llvm/llvm-project/pull/77795