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Per http://llvm.org/OpenProjects.html#llvm_loopnest, the goal of this patch (and other following patches) is to create facilities that allow implementing loop nest passes that run on top-level loop nests for the New Pass Manager. This patch extends the functionality of LoopPassManager to handle loop-nest passes by specializing the definition of LoopPassManager that accepts both kinds of passes in addPass. Only loop passes are executed if L is not a top-level one, and both kinds of passes are executed if L is top-level. Currently, loop nest passes should have the following run method: PreservedAnalyses run(LoopNest &, LoopAnalysisManager &, LoopStandardAnalysisResults &, LPMUpdater &); Reviewed By: Whitney, ychen Differential Revision: https://reviews.llvm.org/D87045
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