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InstCombine can be uncooperative to vectorization and sink loads into conditional blocks. This prevents vectorization. Undo this optimization if there are unconditional memory accesses to the same addresses in the loop. radar://13815763 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@181860 91177308-0d34-0410-b5e6-96231b3b80d8
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