Avoid duplicate lookups when Get+Creating identity hashes

src/objects.h

Index: src/objects.h
diff --git a/src/objects.h b/src/objects.h
index 929c6ca9b3d50f20162571d9220adc7a5477cba8..aeb5e432b9c0ebaa81addfde8ec01e760de68380 100644
--- a/src/objects.h
+++ b/src/objects.h
@@ -1925,9 +1925,8 @@ class JSReceiver: public HeapObject {
                                                   bool from_javascript,
                                                   ShouldThrow should_throw);
 
-
-  static Handle<Object> GetDataProperty(Handle<JSReceiver> object,
-                                        Handle<Name> name);
+  inline static Handle<Object> GetDataProperty(Handle<JSReceiver> object,
+                                               Handle<Name> name);
   static Handle<Object> GetDataProperty(LookupIterator* it);
 
 
@@ -2213,8 +2212,6 @@ class JSObject: public JSReceiver {
   // Returns true if the object has a property with the hidden string as name.
   static bool HasHiddenProperties(Handle<JSObject> object);
 
-  static void SetIdentityHash(Handle<JSObject> object, Handle<Smi> hash);
-
   static void ValidateElements(Handle<JSObject> object);
 
   // Makes sure that this object can contain HeapObject as elements.