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df403b36e6
To fix PR28014, this patch restricts tail merging to blocks that belong to the same loop after MBP. Differential Revision: https://reviews.llvm.org/D23191 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@278463 91177308-0d34-0410-b5e6-96231b3b80d8