| Index: src/objects.h | 
| diff --git a/src/objects.h b/src/objects.h | 
| index df170ed29120c798440538a18cffeaf42c00575e..40c48653a34fc8eb64d6aed49da52fc676be5939 100644 | 
| --- a/src/objects.h | 
| +++ b/src/objects.h | 
| @@ -2915,6 +2915,8 @@ class DescriptorArray: public FixedArray { | 
| // necessary. | 
| INLINE(int SearchWithCache(Name* name, Map* map)); | 
|  | 
| +  bool IsEqualUpTo(DescriptorArray* desc, int nof_descriptors); | 
| + | 
| // Allocates a DescriptorArray, but returns the singleton | 
| // empty descriptor array object if number_of_descriptors is 0. | 
| static Handle<DescriptorArray> Allocate(Isolate* isolate, | 
|  |