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

src/hydrogen-minus-zero.h

-// Copyright 2013 the V8 project authors. All rights reserved.
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-
-#ifndef V8_HYDROGEN_MINUS_ZERO_H_
-#define V8_HYDROGEN_MINUS_ZERO_H_
-
-#include "hydrogen.h"
-
-namespace v8 {
-namespace internal {
-
-
-class HComputeMinusZeroChecksPhase : public HPhase {
- public:
-  explicit HComputeMinusZeroChecksPhase(HGraph* graph)
-      : HPhase("H_Compute minus zero checks", graph),
-        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 in_worklist_;
-  ZoneList<HValue*> worklist_;
-
-  DISALLOW_COPY_AND_ASSIGN(HComputeMinusZeroChecksPhase);
-};
-
-
-} }  // namespace v8::internal
-
-#endif  // V8_HYDROGEN_MINUS_ZERO_H_