Merge pull request #5064 from harold-b/hb/objc-classes

Add support for Objective-C class implementation

src/entity.cpp

@@ -235,6 +235,10 @@ struct Entity {
 			Type * type_parameter_specialization;
 			String ir_mangled_name;
 			bool   is_type_alias;
+			bool   objc_is_implementation;
+			Type*  objc_superclass;
+			Type*  objc_ivar;
+			Entity*objc_context_provider;
 			String objc_class_name;
 			TypeNameObjCMetadata *objc_metadata;
 		} TypeName;