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bbfda9c125
When trying to convert a BUILD_VECTOR into a shuffle, we try to split a single source vector that is twice as wide as the destination vector. We can not do this when we also need the zero vector to create a blend. This fixes PR22774. Differential Revision: http://reviews.llvm.org/D8040 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@231219 91177308-0d34-0410-b5e6-96231b3b80d8