Remove PropertyCell space

src/hydrogen-gvn.h

 // Copyright 2013 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef V8_HYDROGEN_GVN_H_
 #define V8_HYDROGEN_GVN_H_
 
 #include <iosfwd>
 
 #include "src/hydrogen.h"
@@ skipping 52 matching lines @@
 // field stores don't prevent hoisting and merging of global variable/inobject
 // field loads.
 class SideEffectsTracker FINAL BASE_EMBEDDED {
  public:
   SideEffectsTracker() : num_global_vars_(0), num_inobject_fields_(0) {}
   SideEffects ComputeChanges(HInstruction* instr);
   SideEffects ComputeDependsOn(HInstruction* instr);
 
  private:
   friend std::ostream& operator<<(std::ostream& os, const TrackedEffects& f);
-  bool ComputeGlobalVar(Unique<Cell> cell, int* index);
+  bool ComputeGlobalVar(Unique<PropertyCell> cell, int* index);
   bool ComputeInobjectField(HObjectAccess access, int* index);
 
   static int GlobalVar(int index) {
     DCHECK(index >= 0);
     DCHECK(index < kNumberOfGlobalVars);
     return index;
   }
   static int InobjectField(int index) {
     DCHECK(index >= 0);
     DCHECK(index < kNumberOfInobjectFields);
     return index + kNumberOfGlobalVars;
   }
 
   // Track up to four global vars.
   static const int kNumberOfGlobalVars = 4;
-  Unique<Cell> global_vars_[kNumberOfGlobalVars];
+  Unique<PropertyCell> global_vars_[kNumberOfGlobalVars];
   int num_global_vars_;
 
   // Track up to n inobject fields.
   static const int kNumberOfInobjectFields =
       SideEffects::kNumberOfSpecials - kNumberOfGlobalVars;
   HObjectAccess inobject_fields_[kNumberOfInobjectFields];
   int num_inobject_fields_;
 };
 
 
@@ skipping 44 matching lines @@
   // Used when collecting side effects on paths from dominator to
   // dominated.
   BitVector visited_on_paths_;
 
   DISALLOW_COPY_AND_ASSIGN(HGlobalValueNumberingPhase);
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_HYDROGEN_GVN_H_