[PATCH] D115366: AMDGPU: Mark scc defs dead in SGPR to VMEM path for no free SGPRs

[Matt Arsenault via Phabricator via llvm-commits]

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This introduces verifier errors into this broken situation which we do
not handle correctly, which is better than being silently
miscompiled. For the emergency stack slot, the scavenger likes to move
the restore instruction as late as possible, which ends up separating
the SCC def from the conditional branch.


https://reviews.llvm.org/D115366

Files:
  llvm/lib/Target/AMDGPU/SIRegisterInfo.cpp
  llvm/test/CodeGen/AMDGPU/scc-clobbered-sgpr-to-vmem-spill.ll

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