Restrict floating control to minimal control-connected component.

src/compiler/scheduler.h

Index: src/compiler/scheduler.h
diff --git a/src/compiler/scheduler.h b/src/compiler/scheduler.h
index e75469090f75ae3736f1adf47cbf9b547bd3d8b2..6b993993139afeb63e071e85f7b4d4afccdb1180 100644
--- a/src/compiler/scheduler.h
+++ b/src/compiler/scheduler.h
@@ -16,6 +16,7 @@ namespace v8 {
 namespace internal {
 namespace compiler {
 
+class ControlEquivalence;
 class SpecialRPONumberer;
 
 // Computes a schedule from a graph, placing nodes into basic blocks and
@@ -48,8 +49,6 @@ class Scheduler {
     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.
-    bool is_floating_control_;   // {true} if control, but not control-connected
-                                 // to the end node.
     Placement placement_;        // Whether the node is fixed, schedulable,
                                  // coupled to another node, or not yet known.
   };
@@ -62,6 +61,7 @@ class Scheduler {
   ZoneQueue<Node*> schedule_queue_;      // Worklist of schedulable nodes.
   ZoneVector<SchedulerData> node_data_;  // Per-node data for all nodes.
   SpecialRPONumberer* special_rpo_;      // Special RPO numbering of blocks.
+  ControlEquivalence* equivalence_;      // Control dependence equivalence.
 
   Scheduler(Zone* zone, Graph* graph, Schedule* schedule);