[Dominators] Teach IDF to use level information
Summary: This patch teaches IteratedDominanceFrontier to use the level information stored in DomTreeNodes instead of calculating it manually. Reviewers: dberlin, sanjoy, davide Reviewed By: davide Subscribers: davide, llvm-commits Differential Revision: https://reviews.llvm.org/D34703 llvm-svn: 306894
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