[llvm-branch-commits] [BOLT][NFC] Register profiled functions once (PR #150622)

[Amir Ayupov via llvm-branch-commits]

https://github.com/aaupov created https://github.com/llvm/llvm-project/pull/150622

While registering profiled functions, only handle each address once.
Speeds up `DataAggregator::preprocessProfile`.

Test Plan:
For intermediate size pre-aggregated profile (10MB), reduces parsing
time from ~0.41s down to ~0.16s.