[PATCH] D39970: AMDGPU: Fix producing saveexec when the copy is spilled

[Matt Arsenault via Phabricator via llvm-commits]

arsenm created this revision.
Herald added subscribers: t-tye, tpr, dstuttard, yaxunl, nhaehnle, wdng, kzhuravl, qcolombet.

If the register from the copy from exec was spilled,
the copy before the spill was deleted leaving a spill
of undefined register verifier error and miscompiling.
Check for other use instructions of the copy register


https://reviews.llvm.org/D39970

Files:
  lib/Target/AMDGPU/SIOptimizeExecMasking.cpp
  test/CodeGen/AMDGPU/undefined-physreg-sgpr-spill.mir

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