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Summary: This patch will add loop metadata on the pre and post loops generated by IRCE. Currently, we have metadata for disabling optimizations such as vectorization, unrolling, loop distribution and LICM versioning (and confirmed that these optimizations check for the metadata before proceeding with the transformation). The pre and post loops generated by IRCE need not go through loop opts (since these are slow paths). Added two test cases as well. Reviewers: sanjoy, reames Subscribers: llvm-commits Differential Revision: https://reviews.llvm.org/D26806 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@289588 91177308-0d34-0410-b5e6-96231b3b80d8