[Dominators] Improve error checking in deleteEdge
Summary: This patch improves error detection in deleteEdge. It asserts that the edge doesn't exist in the CFG and that DomTree knew about this edge before. Reviewers: dberlin, grosser, brzycki, sanjoy Reviewed By: dberlin Subscribers: llvm-commits Differential Revision: https://reviews.llvm.org/D35571 llvm-svn: 308354
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