re PR target/54546 (SH: Enable -fshrink-wrap)

       PR target/54546
       * config/sh/sh-protos.h (sh_need_epilogue): Delete.
       (sh_can_use_simple_return_p): Declare.
       * config/sh/sh.c (sh_can_use_simple_return_p): Define.
       (sh_need_epilogue, sh_need_epilogue_known): Delete.
       (sh_output_function_epilogue): Remove sh_need_epilogue_known.
       * config/sh/sh.md (simple_return, return): Define.
       (epilogue): Use inline return rtl.
       (sh_expand_epilogue): Cleanup parameters boolean type.
       * config/sh/iterators.md (any_return): New iterator.

From-SVN: r191301