[clang] [PAC] Add support for __ptrauth type qualifier (PR #100830)

[Aaron Ballman via cfe-commits]

================
@@ -9358,6 +9398,8 @@ def ext_typecheck_cond_pointer_integer_mismatch : ExtWarn<
   "pointer/integer type mismatch in conditional expression"
   "%diff{ ($ and $)|}0,1">,
   InGroup<DiagGroup<"conditional-type-mismatch">>;
+def err_typecheck_cond_incompatible_ptrauth : Error<
+  "__ptrauth qualification mismatch%diff{ ($ and $)|}0,1">;
----------------
AaronBallman wrote:

```suggestion
  ";__ptrauth' qualification mismatch%diff{ ($ and $)|}0,1">;
```

https://github.com/llvm/llvm-project/pull/100830