```
Node* G1BarrierSetC2::atomic_xchg_at_resolved(C2AtomicParseAccess& access, Node* new_val, const Type* value_type) const {
  GraphKit* kit = access.kit();
  if (!access.is_oop()) {
    return BarrierSetC2::atomic_xchg_at_resolved(access, new_val, value_type);
  }
  access.set_barrier_data(G1C2BarrierPre | G1C2BarrierPost);
  return BarrierSetC2::atomic_xchg_at_resolved(access, new_val, value_type);
}
```

`kit` is unused. The same unused-var also occurs in `atomic_cmpxchg_val_at_resolved` and `atomic_cmpxchg_bool_at_resolved`