[llvm] [PAC][IR][AArch64] Add "ptrauth(...)" Constant to represent signed pointers. (PR #85738)

[Nikita Popov via llvm-commits]

https://github.com/nikic commented:

Looks good in terms of IR, but someone familiar with ptrauth should take a look at this as well...

https://github.com/llvm/llvm-project/pull/85738