Wolfgang Pieb b43a1d1bd9 [PGO] Do not create block count annotations when all weights are 0,
avoiding an assertion.

A BB with a nonzero count, whose successor blocks all have 0 counts, could
cause an assertion. Don't create any branch weights in this case.

Reviewed By: xur

Differential Revision: https://reviews.llvm.org/D134203
2022-10-13 14:57:42 -07:00
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