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

[Saleem Abdulrasool via cfe-commits]

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@@ -2622,6 +2641,31 @@ def SwiftPrivate : InheritableAttr {
   let SimpleHandler = 1;
 }
 
+def SwiftVersioned : Attr {
+  // This attribute has no spellings as it is only ever created implicitly
+  // from API notes.
+  let Spellings = [];
+  let Args = [VersionArgument<"Version">, AttrArgument<"AttrToAdd">,
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compnerd wrote:

I imagine that we cannot change the attribute name?  I think that `Addition` or `AdditionalAttribute` would've been more fitting.

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