ia64.c (struct reg_write_state): Change into unsigned short bitfields rather than...

ia64.c (struct reg_write_state): Change into unsigned short bitfields rather than unsigned int...

	* config/ia64/ia64.c (struct reg_write_state): Change into
	unsigned short bitfields rather than unsigned int, decrease
	first_pred to just 10 bits.
	(rws_insn): Change into a bitmap or if not ENABLE_CHECKING
	into two char array.
	(rws_insn_set, rws_insn_test): New functions.
	(in_safe_group_barrier): New variable.
	(rws_update): Remove first argument, always set rws_sum array.
	(rws_access_regno): Use rws_insn_set macro.  Only call rws_update
	or update rws_sum if !in_safe_group_barrier, adjust rws_update
	args.
	(rtx_needs_barrier): Use rws_insn_test macro.
	(safe_group_barrier_needed): Don't save/restore rws_sum array,
	instead set/clear in_safe_group_barrier flag.

From-SVN: r129861