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Summary: This is patch 2 of the new DivergenceAnalysis (https://reviews.llvm.org/D50433). This patch contains a generic divergence analysis implementation for unstructured, reducible Control-Flow Graphs. It contains two new classes. The `SyncDependenceAnalysis` class lazily computes sync dependences, which relate divergent branches to points of joining divergent control. The `DivergenceAnalysis` class contains the generic divergence analysis implementation. Reviewers: nhaehnle Reviewed By: nhaehnle Subscribers: sameerds, kristina, nhaehnle, xbolva00, tschuett, mgorny, llvm-commits Differential Revision: https://reviews.llvm.org/D51491 llvm-svn: 344734
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