LibJS+LibWeb: Wrap raw JS::Cell*/& fields in GCPtr/NonnullGCPtr

Author: https://github.com/mattco98
Commit: 7c0c1c8f49
Pull-request: https://github.com/SerenityOS/serenity/pull/17743
Reviewed-by: https://github.com/linusg ✅

Userland/Libraries/LibJS/Runtime/ArgumentsObject.h

@@ -35,8 +35,8 @@ private:
 
     virtual void visit_edges(Cell::Visitor&) override;
 
-    Environment& m_environment;
-    Object* m_parameter_map { nullptr };
+    NonnullGCPtr<Environment> m_environment;
+    GCPtr<Object> m_parameter_map;
 };
 
 }