[llvm] [llvm][aarch64] Add support for the MS qualifiers __ptr32, __ptr64, _sptr, __uptr (PR #112793)

[Daniel Paoliello via llvm-commits]

dpaoliello wrote:

> Is it possible to end up with operations other than load/store using these address-spaces? Like, for example, memcpy?

To my knowledge, no: I modeled this after how `__ptr32` is handles for x64 (which it was originally added for) and System Z (which had a nice, clean single PR to reference).

I experimented with `memcpy` intrinsic, but it's defined to take two regular pointers so Clang/LLVM inserted address space casts automatically.

https://github.com/llvm/llvm-project/pull/112793