[lld] [LLD][COFF] Implement support for hybrid IAT on ARM64X (PR #124189)

[Martin Storsjö via llvm-commits]

https://github.com/mstorsjo commented:

Looking kinda ok I think, but this one was hard to understand properly, so I have a bunch of questions.

https://github.com/llvm/llvm-project/pull/124189