[clang] [APINotes] Upstream Sema logic to apply API Notes to decls (PR #73017)

[Saleem Abdulrasool via cfe-commits]

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@@ -301,6 +301,9 @@ class VariadicEnumArgument<string name, string type, list<string> values,
   bit IsExternalType = isExternalType;
 }
 
+// Represents an attribute wrapped by another attribute.
+class AttrArgument<string name, bit opt = 0> : Argument<name, opt>;
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compnerd wrote:

Does it make sense to name this `WrappedAttribute` instead?

https://github.com/llvm/llvm-project/pull/73017