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a9baf1ecfd
Reapply r191108 with a fix for a memory corruption error I introduced. Of course, we can't reference the scalars that we replace by vectorizing and then call their eraseFromParent method. I only 'needed' the scalars to get the DebugLoc. Just store the DebugLoc before actually vectorizing instead. As a nice side effect, this also simplifies the interface between BoUpSLP and the HorizontalReduction class to returning a value pointer (the vectorized tree root). radar://14607682 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@191123 91177308-0d34-0410-b5e6-96231b3b80d8
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