[PATCH] D50914: [RegisterCoalescer] Fix for assert in removePartialRedundancy

[Tim Renouf via Phabricator via llvm-commits]

tpr created this revision.
Herald added subscribers: llvm-commits, nhaehnle, qcolombet, MatzeB.

I got "Use not jointly dominated by defs" when removePartialRedundancy
attempted to prune then re-extend a subrange whose only liveness was a
dead def at the copy being removed.

Change-Id: I6f894e9f517f71e921e0c6d81d28c5f344db8dad


Repository:
  rL LLVM

https://reviews.llvm.org/D50914

Files:
  lib/CodeGen/RegisterCoalescer.cpp
  test/CodeGen/AMDGPU/regcoalescing-remove-partial-redundancy-assert.mir

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