[clang] [llvm] [Dwarf] Support heterogeneous DW_{OP,AT}s needed for AMDGPU CFI (PR #153883)

[Orlando Cazalet-Hyams via llvm-commits]

https://github.com/OCHyams commented:

Hi, sorry it took me some time to get to this. It's already got approval and I'm not not overly familiar with some of this, but FWIW I think it SGTM too. I've got some inline questions that are to help me understand the change a bit more, but I don't think should block you merging this.

https://github.com/llvm/llvm-project/pull/153883