Avoid dictionary expansion during bootstrapping

src/objects.h

 // Copyright 2006-2009 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 1566 matching lines @@
   Object* AddSlowProperty(String* name,
                           Object* value,
                           PropertyAttributes attributes);
 
   // Add a property to an object.
   Object* AddProperty(String* name,
                       Object* value,
                       PropertyAttributes attributes);
 
   // Convert the object to use the canonical dictionary
-  // representation.
-  Object* NormalizeProperties(PropertyNormalizationMode mode);
+  // representation. If the object is expected to have additional properties
+  // added this number can be indicated to have the backing store allocated to
+  // an initial capacity for holding these properties.
+  Object* NormalizeProperties(PropertyNormalizationMode mode,
+                              int expected_additional_properties);
   Object* NormalizeElements();
 
   // Transform slow named properties to fast variants.
   // Returns failure if allocation failed.
   Object* TransformToFastProperties(int unused_property_fields);
 
   // Access fast-case object properties at index.
   inline Object* FastPropertyAt(int index);
   inline Object* FastPropertyAtPut(int index, Object* value);
 
@@ skipping 3185 matching lines @@
     } else {
       value &= ~(1 << bit_position);
     }
     return value;
   }
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_OBJECTS_H_