AMDGPU: Handle rewriting VGPR MFMA to AGPR with subregister copies#153019

arsenm merged 2 commits intomainllvm/llvm-project:mainfrom

users/arsenm/amdgpu/allow-subregister-copies-mfma-rewrite-candidatesllvm/llvm-project:users/arsenm/amdgpu/allow-subregister-copies-mfma-rewrite-candidatesCopy head branch name to clipboard