[PATCH] D122607: AMDGPU: Delete spills of undef values

[Matt Arsenault via Phabricator via llvm-commits]

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It would be a bit more logical to preserve the undef and do the normal
expansion, but this is less work. This avoids verifier errors in a
future patch which starts deleting liveness from registers after
allocation failures which results in spills of undef values.


https://reviews.llvm.org/D122607

Files:
  llvm/lib/Target/AMDGPU/SIRegisterInfo.cpp
  llvm/test/CodeGen/AMDGPU/sgpr-spill-partially-undef.mir
  llvm/test/CodeGen/AMDGPU/spill-agpr-partially-undef.mir
  llvm/test/CodeGen/AMDGPU/vgpr-spill.mir

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