LibJS: Implement get Intl.Collator.prototype.compare

Author: https://github.com/IdanHo
Commit: 6558f4ae6b
Pull-request: https://github.com/SerenityOS/serenity/pull/12687
Reviewed-by: https://github.com/linusg
Reviewed-by: https://github.com/trflynn89 ✅

Userland/Libraries/LibJS/Runtime/Intl/Collator.cpp

@@ -91,5 +91,10 @@ StringView Collator::case_first_string() const
         VERIFY_NOT_REACHED();
     }
 }
+void Collator::visit_edges(Visitor& visitor)
+{
+    Base::visit_edges(visitor);
+    visitor.visit(m_bound_compare);
+}
 
 }