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This is the IR optimizer follow-on patch for D8563: the x86 backend patch that converts this kind of shuffle back into a vperm2. This is also a continuation of the transform that started in D8486. In that patch, Andrea suggested that we could convert vperm2 intrinsics that use zero masks into a single shuffle. This is an implementation of that suggestion. Differential Revision: http://reviews.llvm.org/D8567 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@233110 91177308-0d34-0410-b5e6-96231b3b80d8
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