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Extracting the similar regions is the first step in the IROutliner. Using the IRSimilarityIdentifier, we collect the SimilarityGroups and sort them by how many instructions will be removed. Each IRSimilarityCandidate is used to define an OutlinableRegion. Each region is ordered by their occurrence in the Module and the regions that are not compatible with previously outlined regions are discarded. Each region is then extracted with the CodeExtractor into its own function. We test that correctly extract in: test/Transforms/IROutliner/extraction.ll test/Transforms/IROutliner/address-taken.ll test/Transforms/IROutliner/outlining-same-globals.ll test/Transforms/IROutliner/outlining-same-constants.ll test/Transforms/IROutliner/outlining-different-structure.ll Recommit of bf899e891387d07dfd12de195ce2a16f62afd5e0 fixing memory leaks. Reviewers: paquette, jroelofs, yroux Differential Revision: https://reviews.llvm.org/D86975
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