[lld] [lld][MachO] Key branch-extension thunks on (referent, addend) (PR #191808)

[Zhaoxuan Jiang via llvm-commits]

nocchijiang wrote:

Hey @alx32, saw you dealt with the addend thing in #177430. Mind taking a look at this one when you get a chance?

https://github.com/llvm/llvm-project/pull/191808