diff --git a/src/objects.h b/src/objects.h
index 4893666..0030496 100644
--- a/src/objects.h
+++ b/src/objects.h
@@ -179,7 +179,7 @@
   class TypeField:       public BitField<PropertyType,       0, 3> {};
   class AttributesField: public BitField<PropertyAttributes, 3, 3> {};
   class DeletedField:    public BitField<uint32_t,           6, 1> {};
-  class IndexField:      public BitField<uint32_t,           7, 31-7> {};
+  class IndexField:      public BitField<uint32_t,           7, 32-7> {};
 
   static const int kInitialIndex = 1;
  private:
@@ -1301,6 +1301,9 @@
   // Return the object's prototype (might be Heap::null_value()).
   inline Object* GetPrototype();
 
+  // Set the object's prototype (only JSObject and null are allowed).
+  Object* SetPrototype(Object* value, bool skip_hidden_prototypes);
+
   // Tells whether the index'th element is present.
   inline bool HasElement(uint32_t index);
   bool HasElementWithReceiver(JSObject* receiver, uint32_t index);
@@ -3200,6 +3203,10 @@
   inline bool try_full_codegen();
   inline void set_try_full_codegen(bool flag);
 
+  // Check whether a inlined constructor can be generated with the given
+  // prototype.
+  bool CanGenerateInlineConstructor(Object* prototype);
+
   // For functions which only contains this property assignments this provides
   // access to the names for the properties assigned.
   DECL_ACCESSORS(this_property_assignments, Object)