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Implemented frequency based cost/saving analysis and related options. The pass is now in a state ready to be turne on in the pipeline (in follow up). Differential Revision: http://reviews.llvm.org/D32783 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@302967 91177308-0d34-0410-b5e6-96231b3b80d8