Move array-type va_list handling to build_va_arg

2015-05-18  Tom de Vries  <tom@codesourcery.com>

	* gimplify.c (gimplify_modify_expr): Remove do_deref handling.
	(gimplify_va_arg_expr): Remove do_deref handling.  Remove adding of
	address operator to va_list operand.
	* tree-stdarg.c (expand_ifn_va_arg_1): Do deref of va_list operand
	unconditionally.
	* config/i386/i386.c (ix86_gimplify_va_arg): Remove deref on va_list
	operand.
	* config/rs6000/rs6000.c (rs6000_gimplify_va_arg): Same.
	* config/s390/s390.c (s390_gimplify_va_arg): Same.
	* config/spu/spu.c (spu_gimplify_va_arg_expr): Same.

	* c-common.c (build_va_arg_1): New function.
	(build_va_arg): Add address operator to va_list operand if necessary.

From-SVN: r223286