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

[Anton Korobeynikov via cfe-commits]

asl wrote:

We discussed the naming thing (`extractRawPointerFromAddress` vs `getRawPointerFromAddress`) at pauth call and decided that it would be better to do this renaming now. @ahmedbougacha will coordinate that renaming.

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