Merge the "Compute Minus Zero Checks" phase into the range analysis.

src/hydrogen-range-analysis.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 19 matching lines @@
 
 #include "hydrogen.h"
 
 namespace v8 {
 namespace internal {
 
 
 class HRangeAnalysisPhase : public HPhase {
  public:
   explicit HRangeAnalysisPhase(HGraph* graph)
-      : HPhase("H_Range analysis", graph), changed_ranges_(16, zone()) { }
+      : HPhase("H_Range analysis", graph), changed_ranges_(16, zone()),
+        in_worklist_(graph->GetMaximumValueID(), zone()),
+        worklist_(32, zone()) {}
 
   void Run();
 
  private:
   void TraceRange(const char* msg, ...);
   void InferControlFlowRange(HCompareNumericAndBranch* test,
                              HBasicBlock* dest);
   void UpdateControlFlowRange(Token::Value op, HValue* value, HValue* other);
   void InferRange(HValue* value);
   void RollBackTo(int index);
   void AddRange(HValue* value, Range* range);
+  void AddToWorklist(HValue* value) {
+    if (in_worklist_.Contains(value->id())) return;
+    in_worklist_.Add(value->id());
+    worklist_.Add(value, zone());
+  }
+  void PropagateMinusZeroChecks(HValue* value);
 
   ZoneList<HValue*> changed_ranges_;
+
+  BitVector in_worklist_;
+  ZoneList<HValue*> worklist_;
+
+  DISALLOW_COPY_AND_ASSIGN(HRangeAnalysisPhase);
 };
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_HYDROGEN_RANGE_ANALYSIS_H_