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

[Nikita Popov via llvm-commits]

================
@@ -4748,6 +4748,33 @@ reference to the CFI jump table in the ``LowerTypeTests`` pass. These constants
 may be useful in low-level programs, such as operating system kernels, which
 need to refer to the actual function body.
 
+.. _ptrauth
----------------
nikic wrote:

```suggestion
.. _ptrauth:
```

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