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This patch extend LoopReroll pass to hand the loops which is similar to the following: while (len > 1) { sum4 += buf[len]; sum4 += buf[len-1]; len -= 2; } git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@243171 91177308-0d34-0410-b5e6-96231b3b80d8