Wenlei He 5f187f0afa [SamplePGO] Add switch to honor zero count on block level as accurate ...

Add a new LLVM switch `-profile-sample-block-accurate` to trust zero block counts for branches. Currently we leave out such zero counts when annotating branch weight metadata, which would lead to weights being considered as unknown.

Differential Revision: https://reviews.llvm.org/D110117

2021-09-21 17:06:37 -07:00

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