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b9619110af
up the stack finishing the exploration of each entries children before we're finished in addition to accounting for their low-links. Added a unittest that really hammers home the need for this with interlocking cycles that would each appear distinct otherwise and crash or compute the wrong result. As part of this, nuke a stale fixme and bring the rest of the implementation still more closely in line with the original algorithm. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@206966 91177308-0d34-0410-b5e6-96231b3b80d8