c-tree.h (struct language_function): Add arg_info element.

c-tree.h (struct language_function): Add arg_info element.

	* c-tree.h (struct language_function): Add arg_info element.
	* c-decl.c (current_function_arg_info): New.
	(grokdeclarator, store_parm_decls): Use it instead of
	DECL_ARGUMENTS.
	(c_push_function_context, c_pop_function_context): Save and
	restore it.

From-SVN: r86798