2018-07-23  Jojo  <jijie_rong@c-sky.com>
             Huibin Wang  <huibin_wang@c-sky.com>
             Sandra Loosemore  <sandra@codesourcery.com>
             Chung-Lin Tang  <cltang@codesourcery.com>

         C-SKY port: Backend implementation

         gcc/
         * config/csky/*: New.
         * common/config/csky/*: New.