[llvm] [BOLT] Synchronize BBHashMap and YamlBBs in BAT mode (PR #145124)

[Amir Ayupov via llvm-commits]

aaupov wrote:

Thank you for a detailed report. Can you please share the repro steps to get BAT entries with zero hash? I've tried building and optimizing libcurl but can't get BOLT to output zero hash. We really should never emit zero hashes.

https://github.com/llvm/llvm-project/pull/145124