LibWeb: Add missing visit_edges implementation to RegExpObject

Author: https://github.com/IdanHo
Commit: https://github.com/SerenityOS/serenity/commit/b018114bee
Pull-request: https://github.com/SerenityOS/serenity/pull/23854
Issue: https://github.com/SerenityOS/serenity/issues/23848
Reviewed-by: https://github.com/mattco98 ✅
Reviewed-by: https://github.com/trflynn89

Userland/Libraries/LibJS/Runtime/RegExpObject.cpp

@@ -304,6 +304,12 @@ ByteString RegExpObject::escape_regexp_pattern() const
     return builder.to_byte_string();
 }
 
+void RegExpObject::visit_edges(JS::Cell::Visitor& visitor)
+{
+    Base::visit_edges(visitor);
+    visitor.visit(m_realm);
+}
+
 // 22.2.3.1 RegExpCreate ( P, F ), https://tc39.es/ecma262/#sec-regexpcreate
 ThrowCompletionOr<NonnullGCPtr<RegExpObject>> regexp_create(VM& vm, Value pattern, Value flags)
 {

Userland/Libraries/LibJS/Runtime/RegExpObject.h

@@ -60,6 +60,8 @@ private:
     RegExpObject(Object& prototype);
     RegExpObject(Regex<ECMA262> regex, ByteString pattern, ByteString flags, Object& prototype);
 
+    virtual void visit_edges(Visitor&) override;
+
     ByteString m_pattern;
     ByteString m_flags;
     bool m_legacy_features_enabled { false }; // [[LegacyFeaturesEnabled]]