添加了Copyright

/*------------------------------------------------------------------*/
/* Copyright (C) SSE-USTC, 2014-2015                                */
/*                                                                  */
/*  FILE NAME             :  gc.c                                   */
/*  PRINCIPAL AUTHOR      :  qcLiu                                  */
/*  LANGUAGE              :  Java                                   */
/*  TARGET ENVIRONMENT    :  ANY                                    */
/*  DATE OF FIRST RELEASE :  2014/10/05                             */
/*  DESCRIPTION           :  the tiger compiler 'gc                 */
/*------------------------------------------------------------------*/

/*
* Revision log:
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*/