* sched-int.h (struct _dep): Add member cost.
	(DEP_COST, UNKNOWN_DEP_COST): New macros.
	* sched-deps.c (init_dep_1): Initialize DEP_COST.
	* haifa-sched.c (dep_cost_1): Use and set DEP_COST.
	(sched_change_pattern): Reset it for dependent insns.

From-SVN: r176226