[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:

I am ok with the changes. Though with pauth we'd probably need to rename `getRawPointerFromAddress` to indicate clearer that it has side effects (like `extractRawPointerFromAddress` or something like this)

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