Switch CFGBuilder to use NodeMarker.

src/compiler/scheduler.h

Index: src/compiler/scheduler.h
diff --git a/src/compiler/scheduler.h b/src/compiler/scheduler.h
index b83da7d23f19ff8a0886dd2fa4c20d985fe15f98..9da0b6daa49d93d31c53d8d6a0a43a0762c2a46a 100644
--- a/src/compiler/scheduler.h
+++ b/src/compiler/scheduler.h
@@ -49,7 +49,6 @@ class Scheduler {
   struct SchedulerData {
     BasicBlock* minimum_block_;  // Minimum legal RPO placement.
     int unscheduled_count_;      // Number of unscheduled uses of this node.
-    bool is_connected_control_;  // {true} if control-connected to the end node.
     Placement placement_;        // Whether the node is fixed, schedulable,
                                  // coupled to another node, or not yet known.
   };