[clang] [clang][ptrauth] Add support for querying the ptrauth schema of a type (PR #138482)

[Oliver Hunt via cfe-commits]

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@@ -3981,7 +3981,9 @@ class Parser : public CodeCompletionHandler {
   ExprResult ParseArrayTypeTrait();
   ExprResult ParseExpressionTrait();
 
+  ExprResult ParseBuiltinUnaryExprOrTypeTrait(UnaryExprOrTypeTrait ExprKind);
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ojhunt wrote:

... if something like `ParseBuiltinPtrauthThingy` (Thingy could just remain UETT, but maybe "Operation" or something?)

https://github.com/llvm/llvm-project/pull/138482