Add frontend stuff instrumentation tooling

//+no-instrumentation
@(no_instrumentation)
@(instrumentation_enter)
@(instrumentation_exit)

src/entity.cpp

@@ -251,6 +251,7 @@ struct Entity {
 			bool    generated_from_polymorphic : 1;
 			bool    target_feature_disabled    : 1;
 			bool    entry_point_only           : 1;
+			bool    no_instrumentation         : 1;
 			String  target_feature;
 		} Procedure;
 		struct {