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The benefits of this change include: 1. Remove DeMorgan-matching code that was added specifically to work-around the missing transform in http://reviews.llvm.org/rL248634. 2. Makes the DeMorgan transform work for vectors too. 3. Fix PR28476: https://llvm.org/bugs/show_bug.cgi?id=28476 Extending this transform to other casts and other associative operators may be useful too. See https://reviews.llvm.org/D22421 for a prerequisite for doing that though. Differential Revision: https://reviews.llvm.org/D22271 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@276221 91177308-0d34-0410-b5e6-96231b3b80d8