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LoopVectorize adds llvm.loop.isvectorized, but leaves llvm.loop.vectorize.enable. Do not consider such a loop for user-forced vectorization since vectorization already happened -- by prioritizing llvm.loop.isvectorized except for TM_SuppressedByUser. Fixes http://llvm.org/PR40546 Differential Revision: https://reviews.llvm.org/D57542 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@353082 91177308-0d34-0410-b5e6-96231b3b80d8