haifa-sched.c: Use rtx_insn

haifa-sched.c: Use rtx_insn

gcc/
	* haifa-sched.c (bb_header): Strengthen from rtx * to rtx_insn **.
	(add_delay_dependencies): Strengthen local "pro" from rtx to
	rtx_insn *.
	(recompute_todo_spec): Likewise.
	(dep_cost_1): Likewise for locals "insn", "used".
	(schedule_insn): Likewise for local "dbg".
	(schedule_insn): Likewise for locals "pro", "next".
	(unschedule_insns_until): Likewise for local "con".
	(restore_pattern): Likewise for local "next".
	(estimate_insn_tick): Likewise for local "pro".
	(resolve_dependencies): Likewise for local "next".
	(fix_inter_tick): Likewise.
	(fix_tick_ready): Likewise for local "pro".
	(add_to_speculative_block): Likewise for locals "check", "twin",
	"pro".
	(sched_extend_bb): Likewise for locals "end", "insn".
	(init_before_recovery): Likewise for local "x".
	(sched_create_recovery_block): Likewise for local "barrier".
	(create_check_block_twin): Likewise for local "pro".
	(fix_recovery_deps): Likewise for locals "note", "insn", "jump",
	"consumer".
	(unlink_bb_notes): Update for change to type of bb_header.
	Strengthen locals "prev", "label", "note", "next" from rtx to
	rtx_insn *.
	(clear_priorities): Likewise for local "pro".

From-SVN: r214332