Replace the recursion in PropagateMinusZeroChecks() with a loop and a worklist.

src/hydrogen-minus-zero.h

 // Copyright 2013 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 20 matching lines @@
 #include "hydrogen.h"
 
 namespace v8 {
 namespace internal {
 
 
 class HComputeMinusZeroChecksPhase : public HPhase {
  public:
   explicit HComputeMinusZeroChecksPhase(HGraph* graph)
       : HPhase("H_Compute minus zero checks", graph),
-        visited_(graph->GetMaximumValueID(), zone()) { }
+        in_worklist_(graph->GetMaximumValueID(), zone()),
+        worklist_(32, zone()) {}
 
   void Run();
 
  private:
+  void AddToWorklist(HValue* value) {
+    if (value->CheckFlag(HValue::kBailoutOnMinusZero)) return;
+    if (in_worklist_.Contains(value->id())) return;
+    in_worklist_.Add(value->id());
+    worklist_.Add(value, zone());
+  }
   void PropagateMinusZeroChecks(HValue* value);
 
-  BitVector visited_;
+  BitVector in_worklist_;
+  ZoneList<HValue*> worklist_;
 
   DISALLOW_COPY_AND_ASSIGN(HComputeMinusZeroChecksPhase);
 };
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_HYDROGEN_MINUS_ZERO_H_