Implement all checker specification for Objective-C class implementations and objc_ivar_get intrinsic

src/checker.hpp

@@ -154,7 +154,8 @@ struct AttributeContext {
 	Type *  objc_ivar;
 	Entity *objc_context_provider;
 	bool    objc_is_class_method;
-	bool    objc_is_implementation; // This struct or proc provides a class/method implementation, not a binding to an existing type.
+	bool    objc_is_implementation;     // This struct or proc provides a class/method implementation, not a binding to an existing type.
+	bool    objc_is_disabled_implement; // This means the method explicitly set @objc_implement to false so it won't be inferred from the class' attribute.
 
 	String require_target_feature; // required by the target micro-architecture
 	String enable_target_feature;  // will be enabled for the procedure only