[llvm] Revert "[BOLT][NFC] Register profiled functions once (#150622)" (PR #152597)

[Paschalis Mpeis via llvm-commits]

paschalis-mpeis wrote:

Thanks for the revert @rafaelauler. This [comment](https://github.com/llvm/llvm-project/pull/150622#issuecomment-3135084377) is now resolved, and the AArch64 builds are now green again: [#2692](https://lab.llvm.org/staging/#/builders/219/builds/2692).

>From September, our buildbot would be on the main buildmaster, sending out notifications around the merge time. This would allow faster reaction on the submitted code.

https://github.com/llvm/llvm-project/pull/152597