[lld] ELF: Store EhInputSection relocations to simplify code. NFC (PR #161041)

[Peter Smith via llvm-commits]

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

LGTM. It is a pity that this makes some of MarkLive more complicated, but all I can think of an obvious way of mitigating that. Possibly a helper routine to extract the field, but I don't think that would be worth doing unless it could be used in other places too.

A couple of small suggestions.

https://github.com/llvm/llvm-project/pull/161041