Reverting 3174. Aka reapplying 3150, 3151 and 3159. Aka api accessor

src/handles.h

 // Copyright 2006-2008 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 115 matching lines @@
     // Update the current next field, set the value in the created
     // handle, and return the result.
     ASSERT(cur < current_.limit);
     current_.next = cur + 1;
 
     T** result = reinterpret_cast<T**>(cur);
     *result = value;
     return result;
   }
 
+  // Deallocates any extensions used by the current scope.
+  static void DeleteExtensions();
+
+  static Address current_extensions_address();
+  static Address current_next_address();
+  static Address current_limit_address();
+
  private:
   // Prevent heap allocation or illegal handle scopes.
   HandleScope(const HandleScope&);
   void operator=(const HandleScope&);
   void* operator new(size_t size);
   void operator delete(void* size_t);
 
   static v8::ImplementationUtilities::HandleScopeData current_;
   const v8::ImplementationUtilities::HandleScopeData previous_;
 
@@ skipping 13 matching lines @@
     }
     current_ = *previous;
 #ifdef DEBUG
     ZapRange(current_.next, current_.limit);
 #endif
   }
 
   // Extend the handle scope making room for more handles.
   static internal::Object** Extend();
 
-  // Deallocates any extensions used by the current scope.
-  static void DeleteExtensions();
-
   // Zaps the handles in the half-open interval [start, end).
   static void ZapRange(internal::Object** start, internal::Object** end);
 
   friend class v8::HandleScope;
   friend class v8::ImplementationUtilities;
 };
 
 
 // ----------------------------------------------------------------------------
 // Handle operations.
@@ skipping 168 matching lines @@
  private:
   bool has_been_transformed_;  // Tells whether the object has been transformed.
   int unused_property_fields_;  // Captures the unused number of field.
   Handle<JSObject> object_;    // The object being optimized.
 };
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_HANDLES_H_