[lld] [lld-macho] Implement support for ObjC relative method lists (PR #86231)

[Leandro Lupori via llvm-commits]

luporl wrote:

I have disabled the objc-relative-method-lists-simple.s test on 32-bit ARM targets, in 6b95747087032e8f86af64325780d8471e6fce58, to fix failures with this buildbot:
https://lab.llvm.org/buildbot/#/builders/178/builds/7227

https://github.com/llvm/llvm-project/pull/86231