[llvm] [GOFF] Introduce GOFFWriter class (PR #131216)

[Kai Nacke via llvm-commits]

redstar wrote:

Hopefully this gives a clean build. Ther merge conflict & build failures were caused by the removal of the `Asm` parameter in `recordRelocation()` and `writeObject()`.

https://github.com/llvm/llvm-project/pull/131216