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

[Jessica Clarke via llvm-commits]

jrtc27 wrote:

The reason why I was in favour of splitting this up is that some of the changes are straightforward and can be landed quickly, but others are more invasive (or, skimming this patch, look incorrect, e.g. the GOT relaxation code looks odd to me, but I'd need to remind myself of the details first). Landing the simple stuff first cuts down on the size of the diff that keeps being reviewed/amended/etc.

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