[llvm] [BOLT] Change Relocation Type to 32-bit and add Optional flag (PR #130792)

[Paschalis Mpeis via llvm-commits]

paschalis-mpeis wrote:

>  Better yet, introduce Optional in a new PR where it's being used.

Done, thanks Maksim. Removed `Optional` and will re-introduce it in a new PR.

https://github.com/llvm/llvm-project/pull/130792