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This is in preparation for tail duplication during block placement. See D18226. This needs to be a utility class for 2 reasons. No passes may run after block placement, and also, tail-duplication affects subsequent layout decisions, so it must be interleaved with placement, and can't be separated out into its own pass. The original pass is still useful, and now runs by delegating to the utility class. llvm-svn: 265842
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