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Summary: This adds somewhat basic preparation functionality including: - Formation of funclets via coloring basic blocks. - Cloning of polychromatic blocks to ensure that funclets have unique program counters. - Demotion of values used between different funclets. - Some amount of cleanup once we have removed predecessors from basic blocks. - Verification that we are left with a CFG that makes some amount of sense. N.B. Arguments and numbering still need to be done. Reviewers: rnk, JosephTremoulet Subscribers: llvm-commits Differential Revision: http://reviews.llvm.org/D11750 llvm-svn: 244272
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