[clang] [llvm] [CodeGen][arm64e] Add methods and data members to Address, which are needed to authenticate signed pointers (PR #86923)

[Eli Friedman via cfe-commits]

efriedma-quic wrote:

If you think the coroutine codegen thing is something that needs to be addressed in a followup, can you open a bug for it?

https://github.com/llvm/llvm-project/pull/86923