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
When choosing the best successor for a block, ordinarily we would have preferred a block that preserves the CFG unless there is a strong probability the other direction. For small blocks that can be duplicated we now skip that requirement as well, subject to some simple frequency calculations. Differential Revision: https://reviews.llvm.org/D28583 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@293716 91177308-0d34-0410-b5e6-96231b3b80d8