[PATCH] D89502: AMDGPU: Don't kill super-register with overlapping copy

[Matt Arsenault via Phabricator via llvm-commits]

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This would end up killing part of the result super-register, resulting
in a verifier error on a later use of the overlapping registers.  We
could add kills of any non-aliasing registers, but we should be moving
away from relying on kill flags.


https://reviews.llvm.org/D89502

Files:
  llvm/lib/Target/AMDGPU/SIInstrInfo.cpp
  llvm/test/CodeGen/AMDGPU/accvgpr-copy.mir
  llvm/test/CodeGen/AMDGPU/copy-overlap-vgpr-kill.mir

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