[BOLT][AArch64] Skip BBs only instead of functions (#81989)

After [this
](https://github.com/llvm/llvm-project/commit/846eb76761c858cbfc75700bf68445e0e3ade48e)
commit we noticed that the size of fdata file decreased a lot. That's
why the better and more precise way will be to skip basic blocks with
exclusive instructions only instead of the whole function