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A non-identity copy cannot be coalesced when the phi join destination register is live at the copy site. Also verify the condition that the PHI join source register is only used in the PHI join. Otherwise the coalescing is invalid. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@86322 91177308-0d34-0410-b5e6-96231b3b80d8