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

[Daniil Kovalev via cfe-commits]

================
@@ -1460,6 +1467,12 @@ class QualType {
     return getQualifiers().getPointerAuth();
   }
 
+  bool hasAddressDiscriminatedPointerAuth() const {
+    if (PointerAuthQualifier ptrauth = getPointerAuth())
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kovdan01 wrote:

Nit

```suggestion
    if (PointerAuthQualifier PtrAuth = getPointerAuth())
```

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