* doc/tm.texi.in (FUNCTION_ARG_PADDING): Mention
	TARGET_FUNCTION_ARG_ROUND_BOUNDARY.
	(TARGET_FUNCTION_ARG_ROUND_BOUNDARY): Add hook.
	* function.c (locate_and_pad_parm): Take it into account.
	* target.def (function_arg_round_boundary): New hook.
	* targhooks.c (default_function_arg_round_boundary): New function.
	* targhooks.h (default_function_arg_round_boundary): Declare.
	* doc/tm.texi: Regenerate.

From-SVN: r176207