AMDGPU: Fix crash in rewrite AGPR copy MFMA pass on dead valnos#153915

arsenm merged 1 commit intomainllvm/llvm-project:mainfrom

users/arsenm/amdgpu/fix-vgpr-mfma-dead-vni-crashllvm/llvm-project:users/arsenm/amdgpu/fix-vgpr-mfma-dead-vni-crashCopy head branch name to clipboard