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b8e1111fbf
operands of the expression being written was wrongly thought to be reusable as an inner node of the expression resulting in it turning up as both an inner node *and* a leaf, creating a cycle in the def-use graph. This would have caused the verifier to blow up if things had gotten that far, however it managed to provoke an infinite loop first. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@168291 91177308-0d34-0410-b5e6-96231b3b80d8