[llvm] [BOLT] Improve handling of relocations targeting specific instructions (PR #66395)

[Vladislav Khmelevsky via llvm-commits]

yota9 wrote:

Is it possible to directly address first instruction from second one using -4 offset without relocation, since in this case you can be sure they would be emitted one by one? 

https://github.com/llvm/llvm-project/pull/66395