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fa0e6facc7
after it has finished all of its reassociations, because its habit of unlinking operands and holding them in a datastructure while working means that it's not easy to determine when an instruction is really dead until after all its regular work is done. rdar://9096268. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@127424 91177308-0d34-0410-b5e6-96231b3b80d8