[llvm] [llvm-objdump][macho] Add support for ObjC relative method lists (PR #85477)

[via llvm-commits]

alx32 wrote:

This is a retry of this PR: https://github.com/llvm/llvm-project/pull/84250
After build bots showed that absolute offsets are different on armv7/armv8 builds of objdump. The absolute offsets are now regex's. 

https://github.com/llvm/llvm-project/pull/85477