[clang] [llvm] [CodeGen][arm64e] Add methods and data members to Address, which are needed to authenticate signed pointers (PR #67454)

[Akira Hatanaka via llvm-commits]

ahatanak wrote:

Maybe `emitRawPointerFromAddress` is better. I see a lot of functions starting with `emit` in CodeGen.

https://github.com/llvm/llvm-project/pull/67454