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[Dominators] Move root-finding out of DomTreeBase and simplify it
Summary: This patch moves root-finding logic from DominatorTreeBase to GenericDomTreeConstruction.h. It makes the behavior simpler and more consistent by always adding a virtual root to PostDominatorTrees. Reviewers: dberlin, davide, grosser, sanjoy Reviewed By: dberlin Subscribers: llvm-commits Differential Revision: https://reviews.llvm.org/D35597 llvm-svn: 309146
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