[llvm] [Object] Support COFF MIPS in RelocationResolver (PR #200477)

[Martin Storsjö via llvm-commits]

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

LGTM.

Ideally this patch should also have associated test coverage, but I guess that only comes later when this is used by MIPS support in LLD? I guess that can be fine for now. (I don't offhand remember in which cases this code in RelocationResolver gets used at all, can you remind me?)

https://github.com/llvm/llvm-project/pull/200477