[lld] [ELF] Add target-specific relocation scanning for x86 (PR #178846)

[Peter Smith via llvm-commits]

https://github.com/smithp35 approved this pull request.

I don't have any more comments.

I recognise the tension between common-code but with lots of target specific special cases, and more target specific processing that has the risk of duplicating code.

I'm OK with the trade-off presented here, although will be worth leaving a day or so for others to object.

Not being an x86 person, I've not checked over those parts in detail, they look similar enough to what existed before. If they do need checking, could be worth asking some of the x86 contributors.

https://github.com/llvm/llvm-project/pull/178846