Craig Topper 48187cffe2 [Statistics] Use Statistic::operator+= instead of adding and assigning separately. ...

I believe this technically fixes a multithreaded race condition in this code. But my primary concern was as part of looking at removing the ability to treat Statistics like a plain unsigned. There are many weird operations on Statistics in the codebase.

llvm-svn: 303314

2017-05-17 23:22:10 +00:00

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