struct haifa_sched_info: prev_head and next_tail

gcc/
	* sched-int.h (struct haifa_sched_info): Strengthen fields
	"prev_head" and "next_tail" from rtx to rtx_insn *.

From-SVN: r214477

gcc/ChangeLog

 2014-08-25  David Malcolm  <dmalcolm@redhat.com>
 
+	* sched-int.h (struct haifa_sched_info): Strengthen fields
+	"prev_head" and "next_tail" from rtx to rtx_insn *.
+
+2014-08-25  David Malcolm  <dmalcolm@redhat.com>
+
 	* rtl.h (rtx_jump_table_data::get_labels): New method.
 	* cfgbuild.c (make_edges): Replace hand-coded lookup of labels
 	with use of the new rtx_jump_table_data::get_labels method.

gcc/sched-int.h

@@ -607,7 +607,7 @@ struct haifa_sched_info
   bool (*insn_finishes_block_p) (rtx);
 
   /* The boundaries of the set of insns to be scheduled.  */
-  rtx prev_head, next_tail;
+  rtx_insn *prev_head, *next_tail;
 
   /* Filled in after the schedule is finished; the first and last scheduled
      insns.  */