[llvm] [BOLT] Move target-specific relocation logic into target handlers (PR #217926)

[Alexey Moksyakov via llvm-commits]

yavtuk wrote:

> Thanks for the refactoring! The AArch64 part looks behavior-preserving to me. One nit about testing, since the patch moves most of the AArch64 relocation processing out of Core and behind the new RelocationHandler interface, do we have sufficient AArch64 BOLT test coverage for these path, would it be worth adding some direct tests for AArch64RelocationHandler to ensure the relocation processing remains unchanged?

let us take a look what we can add to test

https://github.com/llvm/llvm-project/pull/217926