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* [VPlan] Introduce VPLoopInfo analysis.Diego Caballero2018-07-311-0/+45
The patch introduces loop analysis (VPLoopInfo/VPLoop) for VPBlockBases. This analysis will be necessary to perform some H-CFG transformations and detect and introduce regions representing a loop in the H-CFG. Reviewers: fhahn, rengolin, mkuper, hfinkel, mssimpso Reviewed By: fhahn Differential Revision: https://reviews.llvm.org/D48816 llvm-svn: 338346
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