Couple the enumeration index of a property to the size of the descriptor array where it first appea…

src/factory.cc

Index: src/factory.cc
diff --git a/src/factory.cc b/src/factory.cc
index 7b915371616863782650b973e22d331f4c0806e6..c0bbb78e2abe979a2c6833b76e465f8ff5b7aef5 100644
--- a/src/factory.cc
+++ b/src/factory.cc
@@ -938,7 +938,6 @@ Handle<DescriptorArray> Factory::CopyAppendCallbackDescriptors(
   // back to front so that the last callback with a given name takes
   // precedence over previously added callbacks with that name.
   int added_descriptor_count = descriptor_count;
-  int next_enum = array->NextEnumerationIndex();
   for (int i = nof_callbacks - 1; i >= 0; i--) {
     Handle<AccessorInfo> entry =
         Handle<AccessorInfo>(AccessorInfo::cast(callbacks.get(i)));
@@ -948,11 +947,8 @@ Handle<DescriptorArray> Factory::CopyAppendCallbackDescriptors(
     // Check if a descriptor with this name already exists before writing.
     if (LinearSearch(*result, EXPECT_UNSORTED, *key, added_descriptor_count) ==
         DescriptorArray::kNotFound) {
-      CallbacksDescriptor desc(*key,
-                               *entry,
-                               entry->property_attributes(),
-                               next_enum++);
-      result->Set(added_descriptor_count, &desc, witness);
+      CallbacksDescriptor desc(*key, *entry, entry->property_attributes(), 0);
+      result->Append(added_descriptor_count, &desc, witness);
       added_descriptor_count++;
     }
   }
@@ -973,7 +969,6 @@ Handle<DescriptorArray> Factory::CopyAppendCallbackDescriptors(
 
   // Sort the result before returning.
   result->Sort(witness);
-  ASSERT(result->NextEnumerationIndex() == next_enum);
   return result;
 }