[PATCH] D59575: Mips: Don't create copy of nothing

[Matt Arsenault via Phabricator via llvm-commits]

arsenm created this revision.
arsenm added a reviewer: atanasyan.
Herald added subscribers: jfb, arichardson, wdng, sdardis.

This was creating a copy of the register the pseudo itself was
def'ing, leaving a copy of an undefined register. I'm not sure how
the verifier is not catching this, but this avoids asserting in a
future change to RegAllocFast


https://reviews.llvm.org/D59575

Files:
  lib/Target/Mips/MipsISelLowering.cpp
  test/CodeGen/Mips/atomic.ll
  test/CodeGen/Mips/atomic64.ll
  test/CodeGen/Mips/atomicCmpSwapPW.ll

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