* objc/Make-lang.in: Update copyright.
        (OBJC_OBJS): Add objc-lang.o.
        (objc-lang.o): New rule.
        * objc/config-lang.in: Fix file description and update
        copyright.
        * objc/objc-act.c: Do not include langhooks.h and
        langhooks-def.h
        (lang_hooks): Move (along with LANG_HOOKS...) to objc-lang.c.
        (objc_post_options): Move to objc-lang.c.
        (objc_init_options): Move to objc-lang.c.
        (objc_init): Make non-static.
        (HASHFUNCTION): Remove macro.
        (hash_func): New function.
        (hash_enter): Replace HASHFUNCTION with hash_func.
        (hash_lookup): Replace HASHFUNCTION with hash_func.
        (maybe_objc_tree_codes): New function.
        (init_objc): Move ObjC tree code initialization to
        maybe_objc_tree_codes().
        * objc/objc-act.h (GCC_OBJC_ACT_H): New include guard.
        (objc_init): New public prototype.
        (objc_decode_option): New public prototype.
        (maybe_add_objc_tree_codes): New public prototype.
        * objc/objc-lang.c: New file.
        (lang_hooks): Moved from objc-act.c.
        (objc_post_options): Moved from objc-act.c.
        (objc_init_options): Moved from objc-act.c.

From-SVN: r47575