SLPVectorizer: Accelerate the isConsecutive check by replacing the subtraction of the two values with a simple SCEV expression that adds the offset to one of the pointers that we compare.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@186479 91177308-0d34-0410-b5e6-96231b3b80d8