* 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.