rs6000.h (RS6000_ALIGN): Implement using ROUND_UP macro.

rs6000.h (RS6000_ALIGN): Implement using ROUND_UP macro.

	* config/rs6000/rs6000.h (RS6000_ALIGN): Implement using
	ROUND_UP macro.
	* config/rs6000/rs6000.c (rs6000_darwin64_record_arg_advance_flush):
	Use ROUND_UP and ROUND_DOWN macros where applicable.
	(rs6000_darwin64_record_arg_flush): Ditto.
	(rs6000_function_arg): Use ROUND_UP to calculate align_words.
	(rs6000_emit_probe_stack_range): Use ROUND_DOWN to calculate
	rounded_size.

	* config/aarch/aarch64.h (AARCH64_ROUND_UP): Remove.
	(AARCH64_ROUND_DOWN): Ditto.
	* config/aarch64/aarch64.c: Use ROUND_UP instead of AARCH64_ROUND_UP.

From-SVN: r228715