[llvm] [AArch64][PAC] Support ptrauth builtins and -fptrauth-intrinsics. (PR #65996)

[David Spickett via llvm-commits]

https://github.com/DavidSpickett commented:

Just went through the document. Great to see the possible attack vectors listed at the end, this will be a good reference for folks.

https://github.com/llvm/llvm-project/pull/65996