[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'm not sure `extractRawPointerFromAddress` conveys the fact that the function might do code-gen instead of just returning some pointer. I wonder if there's a better name.
> 
> `computeRawPointerFromAddress` `genRawPointerFromAddress` `generateRawPointerFromAddress` `codeGenRawPointerFromAddress`
> 
> Thoughts?

I do not have particular preference. But probably like `compute` / `gen` slightly more.

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