Decoupling MarkDescriptorArray as much as possible from the ContentArray.

src/objects-inl.h

 // Copyright 2012 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 1921 matching lines @@
   return number;
 }
 
 
 String* DescriptorArray::GetKey(int descriptor_number) {
   ASSERT(descriptor_number < number_of_descriptors());
   return String::cast(get(ToKeyIndex(descriptor_number)));
 }
 
 
+Object** DescriptorArray::GetValueSlot(int descriptor_number) {
+  ASSERT(descriptor_number < number_of_descriptors());
+  return GetContentArray()->data_start() + ToValueIndex(descriptor_number);
+}
+
+
 Object* DescriptorArray::GetValue(int descriptor_number) {
   ASSERT(descriptor_number < number_of_descriptors());
   return GetContentArray()->get(ToValueIndex(descriptor_number));
 }
 
 
 PropertyDetails DescriptorArray::GetDetails(int descriptor_number) {
   ASSERT(descriptor_number < number_of_descriptors());
   Object* details = GetContentArray()->get(ToDetailsIndex(descriptor_number));
   return PropertyDetails(Smi::cast(details));
@@ skipping 3108 matching lines @@
 #undef WRITE_UINT32_FIELD
 #undef READ_SHORT_FIELD
 #undef WRITE_SHORT_FIELD
 #undef READ_BYTE_FIELD
 #undef WRITE_BYTE_FIELD
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_OBJECTS_INL_H_