Make order of addition the primary order of descriptor arrays.

src/handles.cc

Index: src/handles.cc
diff --git a/src/handles.cc b/src/handles.cc
index 224e51e1e6e1856b94d35a47ccf9938a4e0498f1..353a4346d3e962b5ae71b6fdff82f0d7d9169a67 100644
--- a/src/handles.cc
+++ b/src/handles.cc
@@ -701,7 +701,6 @@ Handle<JSArray> GetKeysFor(Handle<JSReceiver> object, bool* threw) {
 
 Handle<FixedArray> GetEnumPropertyKeys(Handle<JSObject> object,
                                        bool cache_result) {
-  int index = 0;
   Isolate* isolate = object->GetIsolate();
   if (object->HasFastProperties()) {
     if (object->map()->instance_descriptors()->HasEnumCache()) {
@@ -715,44 +714,34 @@ Handle<FixedArray> GetEnumPropertyKeys(Handle<JSObject> object,
     int num_enum = object->NumberOfLocalProperties(DONT_ENUM);
 
     Handle<FixedArray> storage = isolate->factory()->NewFixedArray(num_enum);
-    Handle<FixedArray> sort_array = isolate->factory()->NewFixedArray(num_enum);
-
     Handle<FixedArray> indices;
-    Handle<FixedArray> sort_array2;
 
     if (cache_result) {
       indices = isolate->factory()->NewFixedArray(num_enum);
-      sort_array2 = isolate->factory()->NewFixedArray(num_enum);
     }
 
     Handle<DescriptorArray> descs =
         Handle<DescriptorArray>(object->map()->instance_descriptors(), isolate);
 
+    int index = 0;
     for (int i = 0; i < descs->number_of_descriptors(); i++) {
       if (!descs->GetDetails(i).IsDontEnum()) {
         storage->set(index, descs->GetKey(i));
         PropertyDetails details = descs->GetDetails(i);
-        sort_array->set(index, Smi::FromInt(details.index()));
         if (!indices.is_null()) {
           if (details.type() != FIELD) {
             indices = Handle<FixedArray>();
-            sort_array2 = Handle<FixedArray>();
           } else {
             int field_index = Descriptor::IndexFromValue(descs->GetValue(i));
             if (field_index >= map->inobject_properties()) {
               field_index = -(field_index - map->inobject_properties() + 1);
             }
             indices->set(index, Smi::FromInt(field_index));
-            sort_array2->set(index, Smi::FromInt(details.index()));
           }
         }
         index++;
       }
     }
-    storage->SortPairs(*sort_array, sort_array->length());
-    if (!indices.is_null()) {
-      indices->SortPairs(*sort_array2, sort_array2->length());
-    }
     if (cache_result) {
       Handle<FixedArray> bridge_storage =
           isolate->factory()->NewFixedArray(