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When computing a trace, all the candidates for pred/succ must have been visited. Filter out back-edges first, though. The PO traversal ignores them. Thanks to Andy for spotting this in review. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@160995 91177308-0d34-0410-b5e6-96231b3b80d8