[llvm] [BOLT][NFC] Unify two symbol table iterations (PR #90724)

[Donghee Na via llvm-commits]

corona10 wrote:

Hmm, my system clang-18 and pre-built clang binary from llvm-release page is not able to be processed because of the compile option (in my guess)
```
BOLT-ERROR: instrumentation runtime libraries require relocation
```



https://github.com/llvm/llvm-project/pull/90724