JNIid* InstanceKlass::jni_id_for(int offset) {
  JNIid* probe = jni_ids() == NULL ? NULL : jni_ids()->find(offset);
  if (probe == NULL) {
    probe = jni_id_for_impl(offset);
  }
  return probe;
}
JNIid* InstanceKlass::jni_id_for(int offset) {
  JNIid* probe = jni_ids() == NULL ? NULL : jni_ids()->find(offset);
  if (probe == NULL) {
    probe = jni_id_for_impl(offset);
  }
  return probe;
}