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values rather than an expensive dense map query to test whether children have already been popped into an SCC. This matches the incremental SCC building code. I've also included the assert that I put there but updated both of their text. No functionality changed here. I still don't have any great ideas for sharing the code between the two implementations, but I may try a brute-force approach to factoring it at some point. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@207042 91177308-0d34-0410-b5e6-96231b3b80d8