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/SetIterator.cpp

@@ -25,7 +25,7 @@ SetIterator::SetIterator(Set& set, Object::PropertyKind iteration_kind, Object&
 void SetIterator::visit_edges(Cell::Visitor& visitor)
 {
     Base::visit_edges(visitor);
-    visitor.visit(&m_set);
+    visitor.visit(m_set);
 }
 
 }