LibJS: Make it possible to visit the edges of an ExecutionContext

Author: https://github.com/Lubrsi
Commit: 6431dd7904
Pull-request: https://github.com/SerenityOS/serenity/pull/16428
Reviewed-by: https://github.com/linusg
Reviewed-by: https://github.com/trflynn89 ✅

Userland/Libraries/LibJS/Runtime/ExecutionContext.h

@@ -26,6 +26,8 @@ struct ExecutionContext {
 
     [[nodiscard]] ExecutionContext copy() const;
 
+    void visit_edges(Cell::Visitor&);
+
 private:
     explicit ExecutionContext(MarkedVector<Value> existing_arguments);