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To avoid duplicates in loop metadata, if the string to add is already there, just update the value. Reviewers: reames, Ashutosh Reviewed By: reames Subscribers: hiraditya, llvm-commits Differential Revision: https://reviews.llvm.org/D65265 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@367087 91177308-0d34-0410-b5e6-96231b3b80d8