[runtime] More LookupIterator / Transition related performance tweaks

src/objects.h

 // Copyright 2015 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef V8_OBJECTS_H_
 #define V8_OBJECTS_H_
 
 #include <iosfwd>
 
 #include "src/allocation.h"
@@ skipping 2940 matching lines @@
   inline Object** GetEnumCacheSlot();
 
   void ClearEnumCache();
 
   // Initialize or change the enum cache,
   // using the supplied storage for the small "bridge".
   static void SetEnumCache(Handle<DescriptorArray> descriptors,
                            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);
   inline Object* GetValue(int descriptor_number);
   inline void SetValue(int descriptor_number, Object* value);
   inline Object** GetValueSlot(int descriptor_number);
   static inline int GetValueOffset(int descriptor_number);
   inline Object** GetDescriptorStartSlot(int descriptor_number);
   inline Object** GetDescriptorEndSlot(int descriptor_number);
   inline PropertyDetails GetDetails(int descriptor_number);
@@ skipping 7877 matching lines @@
     }
     return value;
   }
 };
 
 
 }  // NOLINT, false-positive due to second-order macros.
 }  // NOLINT, false-positive due to second-order macros.
 
 #endif  // V8_OBJECTS_H_