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merging 128-bit subvectors and also shuffling all the elements of those subvectors. Currently we generate pretty bad code for many of these, but I'm testing a patch that should dramatically improve this in addition to making the shuffle lowering robust to other changes. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@222525 91177308-0d34-0410-b5e6-96231b3b80d8