[runtime] More LookupIterator / Transition related performance tweaks

src/objects.h

Index: src/objects.h
diff --git a/src/objects.h b/src/objects.h
index 8f64a3677eb15731aa3755be76d3f89465723ce5..0e50a3b8f604504d3ddbe87e3a214b7238bdd9f1 100644
--- a/src/objects.h
+++ b/src/objects.h
@@ -2958,8 +2958,6 @@ class DescriptorArray: public FixedArray {
                            Isolate* isolate, Handle<FixedArray> new_cache,
                            Handle<FixedArray> new_index_cache);
 
-  bool CanHoldValue(int descriptor, Object* value);
-
   // Accessors for fetching instance descriptor at descriptor number.
   inline Name* GetKey(int descriptor_number);
   inline Object** GetKeySlot(int descriptor_number);