[llvm] [BOLT] Discard BB profiles with a hash of 0 in yaml from a Post-BAT binary (PR #169627)

[Amir Ayupov via llvm-commits]

aaupov wrote:

Thank you for the report. I have the proper fix, just need to put up a test case reproing the behavior. Please hold off with this diff, I'll put it up shortly.

https://github.com/llvm/llvm-project/pull/169627