[lld] Enough LLD changes to bootstrap OpenBSD on sparc64 (PR #207609)

[Kirill A. Korinsky via llvm-commits]

catap wrote:

Here it is. I hope I haven't broke anything. We can discuss it and I'll cherry-pick agreed commits and rebase that branch.

Not sure that I can make them smaller.

https://github.com/llvm/llvm-project/pull/207609