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1fc7d715aa
can only branch forward. To best take advantage of them, we'd like to adjust the basic blocks around a bit when reasonable. This patch puts basics in place to do that, with a super-simple algorithm for backwards jump table targets that creates a new branch after the jump table which branches backwards. Real heuristics for reordering blocks or other modifications rather than inserting branches will follow. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@86791 91177308-0d34-0410-b5e6-96231b3b80d8
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