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f5225573b7
to be more general and understand more varieties of loops. Teach CodePlacementOpt to reorganize the basic blocks of a loop so that they are contiguous. This also includes a fair amount of logic for preserving fall-through edges while doing so. This fixes a BranchFolding-ism where blocks which can't be made to use a fall-through edge and don't conveniently fit anywhere nearby get tossed out to the end of the function. llvm-svn: 84295