Fix break in r183446 - helps to increment the iterator in a loop

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@183454 91177308-0d34-0410-b5e6-96231b3b80d8
Jeffrey Yasskin volunteered to benchmark the vectorizer on -O2 or -Os when compiling chrome. This patch adds a new flag to enable vectorization on all levels and not only on -O3. It should go away once we make a decision.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@183456 91177308-0d34-0410-b5e6-96231b3b80d8