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The only real user of the flag was removeCopyByCommutingDef(), and it has been switched to LiveIntervals::hasPHIKill(). All the code changed by this patch was only concerned with computing and propagating the flag. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@161255 91177308-0d34-0410-b5e6-96231b3b80d8