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Summary: This change adds MathExtras helper functions for handling unsigned, saturating addition and multiplication. It also updates the instrumentation and sample profile merge implementations to use them. No functional changes. Reviewers: dnovillo, bogner, davidxl Subscribers: davidxl, llvm-commits Differential Revision: http://reviews.llvm.org/D14720 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@253412 91177308-0d34-0410-b5e6-96231b3b80d8