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sext{C1,+,C2} --> sext(C1) + sext{0,+,C2} transformation in Scalar Evolution. That helps SLP-vectorizer to recognize consecutive loads/stores. <rdar://problem/14860614> git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@209568 91177308-0d34-0410-b5e6-96231b3b80d8