If the coalescer commuted a def MI to allow coalescing, it can changed a previously coalesced copy into an non-identity copy.
llvm-svn: 48752
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@ -323,7 +323,8 @@ bool SimpleRegisterCoalescing::RemoveCopyByCommutingDef(LiveInterval &IntA,
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MachineInstr *UseMI = &*UI;
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++UI;
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if (JoinedCopies.count(UseMI))
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continue;
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// It'll no longer be "joined" after the change.
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JoinedCopies.erase(UseMI);
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unsigned UseIdx = li_->getInstructionIndex(UseMI);
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LiveInterval::iterator ULR = IntA.FindLiveRangeContaining(UseIdx);
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if (ULR->valno != AValNo)
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