Add a native data property that replaces itself with a real data property

src/objects.h

 // Copyright 2015 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_OBJECTS_H_
 #define V8_OBJECTS_H_
 
 #include <iosfwd>
 #include <memory>
 
@@ skipping 11200 matching lines @@
 
   inline bool all_can_read();
   inline void set_all_can_read(bool value);
 
   inline bool all_can_write();
   inline void set_all_can_write(bool value);
 
   inline bool is_special_data_property();
   inline void set_is_special_data_property(bool value);
 
+  inline bool replace_on_access();
+  inline void set_replace_on_access(bool value);
+
   inline bool is_sloppy();
   inline void set_is_sloppy(bool value);
 
   inline PropertyAttributes property_attributes();
   inline void set_property_attributes(PropertyAttributes attributes);
 
   // Checks whether the given receiver is compatible with this accessor.
   static bool IsCompatibleReceiverMap(Isolate* isolate,
                                       Handle<AccessorInfo> info,
                                       Handle<Map> map);
@@ skipping 21 matching lines @@
 
 
  private:
   inline bool HasExpectedReceiverType();
 
   // Bit positions in flag.
   static const int kAllCanReadBit = 0;
   static const int kAllCanWriteBit = 1;
   static const int kSpecialDataProperty = 2;
   static const int kIsSloppy = 3;
-  class AttributesField : public BitField<PropertyAttributes, 4, 3> {};
+  static const int kReplaceOnAccess = 4;
+  class AttributesField : public BitField<PropertyAttributes, 5, 3> {};
 
   DISALLOW_IMPLICIT_CONSTRUCTORS(AccessorInfo);
 };
 
 
 // Support for JavaScript accessors: A pair of a getter and a setter. Each
 // accessor can either be
 //   * a pointer to a JavaScript function or proxy: a real accessor
 //   * undefined: considered an accessor by the spec, too, strangely enough
 //   * the hole: an accessor which has not been set
@@ skipping 488 matching lines @@
     }
     return value;
   }
 };
 
 
 }  // NOLINT, false-positive due to second-order macros.
 }  // NOLINT, false-positive due to second-order macros.
 
 #endif  // V8_OBJECTS_H_