llvm-project

1a2960ba - [pgo][nfc] Model `Count` as a `std::optional` in `PGOUseBBInfo` (#83364)

[pgo][nfc] Model `Count` as a `std::optional` in `PGOUseBBInfo` (#83364) Simpler code, compared to tracking state of 2 variables and the ambiguity of "0" CountValue (is it 0 or is it invalid?)