Rong Xu fb4bcc452c [PGO] Exit early if all count values are zero ...

If all the edge counts for a function are zero, skip count population and
annotation, as nothing will happen. This can save some compile time.

Differential Revision: https://reviews.llvm.org/D54212

llvm-svn: 346370

2018-11-07 23:51:20 +00:00

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