[llvm-branch-commits] [BOLT] Drop blocks without profile in BAT YAML (PR #107970)

[Amir Ayupov via llvm-branch-commits]

https://github.com/aaupov created https://github.com/llvm/llvm-project/pull/107970

Align BAT YAML (DataAggregator) to YAMLProfileWriter which drops blocks
without profile:
https://github.com/llvm/llvm-project/blob/main/bolt/lib/Profile/YAMLProfileWriter.cpp#L162-L176

Test Plan: NFCI