static <A, B> LinkedHashMap<A, B> mapPut2_createLinkedHashMap(LinkedHashMap<A, B> map, A key, B value) {
  if (key != null)
    if (value != null) {
      if (map == null) map = new LinkedHashMap;
      map.put(key, value);
    } else if (map != null) map.remove(key);
  ret map;
}

Began life as a copy of #1008151