[clang] [APINotes] Add SWIFT_RETURNS_(UN)RETAINED support to APINotes (PR #118938)

[Gábor Horváth via cfe-commits]

================
@@ -542,6 +542,9 @@ class FunctionInfo : public CommonEntityInfo {
   /// The result type of this function, as a C type.
   std::string ResultType;
 
+  /// Swift name of this entity.
+  std::string SwiftReturnOwnership;
----------------
Xazax-hun wrote:

Do we need a string to represent this? Wouldn't an enum make more sense?

https://github.com/llvm/llvm-project/pull/118938