[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:

@cor3ntin @AaronBallman  I realize I have much more of a problem with this name than you guys seem to have indicated - I'm not sure if it used to be in clang and the non-ptrauth stuff just slowly disappeared, or if we added it on the assumption it would eventually get other things. Either way it's only ptrauth stuff, so I wonder if 

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