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a72d2a210c
CSE and recursive RAUW calls delete a node from the use list, invalidating the use list iterator. There's currently no known way to reproduce this in an unmodified LLVM, however there's no fundamental reason why a SelectionDAG couldn't be formed which would trigger this case. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@97665 91177308-0d34-0410-b5e6-96231b3b80d8