  static GvnBasicBlockState* CreateEntry(Zone* zone,
                                         HBasicBlock* entry_block,
                                         HValueMap* entry_map) {
    return new(zone)
        GvnBasicBlockState(NULL, entry_block, entry_map, NULL, zone);
  }
  static GvnBasicBlockState* CreateEntry(Zone* zone,
                                         HBasicBlock* entry_block,
                                         HValueMap* entry_map) {
    return new(zone)
        GvnBasicBlockState(NULL, entry_block, entry_map, NULL, zone);
  }