[llvm] [BOLT][NFCI] Simplify DataAggregator using traces (PR #143289)

[Paschalis Mpeis via llvm-commits]

https://github.com/paschalis-mpeis approved this pull request.

@aaupov, please go ahead and merge.

After that, Adam can rebase if needed and proceed right after your PR.
BTW feel free to share any thoughts on:
- #129231

https://github.com/llvm/llvm-project/pull/143289