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Summary: In theory, those annotations can help the compiler to emit more optimized code and/or code that suggest CPU the proper way to utilize the instruction pipeline after the coming branch. TBH, it's not clear how exactly beneficial those annotations are (esp. on target architectures) but they certainly don't hurt (in all cases here the favorite code branch is obvious). Reviewed By: mdvacca Differential Revision: D15752969 fbshipit-source-id: 8adf25a48107ffde828f735fb1386b30dbe63ede