Nathan Slingerland 4ee48b13f5 [llvm-profdata] Add SaturatingAdd/SaturatingMultiply Helper Functions
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

llvm-svn: 253412
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