[lld] [ELF] Don't resolve relocations referencing SHN_ABS to tombstone in non-SHF_ALLOC sections (PR #79238)

[Fangrui Song via llvm-commits]

MaskRay wrote:

> @MaskRay Is there an equivalent check that can be done before [1981b1b](https://github.com/llvm/llvm-project/commit/1981b1b6b92f7579a30c9ed32dbdf3bc749c1b40)?

Do you want to cherry pick #74686 and this follow-up #79238 with an older code base like lld 17?
I believe it's difficult before 1981b1b6b92f7579a30c9ed32dbdf3bc749c1b40 . I personally would not try doing that...

You can consider cherry picking 1981b1b6b92f7579a30c9ed32dbdf3bc749c1b40  as well, but there are multiple follow-up commits.

Note, since lld uses relatively stable llvm APIs, if you llvm locked into a certain version, it should be quite straightforward to sync just `lld/` to the trunk version, and `ninja lld` will likely still compile (and if not it'd be straightforward to fix).

https://github.com/llvm/llvm-project/pull/79238