Remove the holder_ field from LookupResult

src/objects.h

 // Copyright 2012 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 5977 matching lines @@
     return
         Smi::cast(cache->get(kProtoTransitionNumberOfEntriesOffset))->value();
   }
 
   inline void SetNumberOfProtoTransitions(int value) {
     FixedArray* cache = GetPrototypeTransitions();
     DCHECK(cache->length() != 0);
     cache->set(kProtoTransitionNumberOfEntriesOffset, Smi::FromInt(value));
   }
 
-  // Lookup in the map's instance descriptors and fill out the result
-  // with the given holder if the name is found. The holder may be
-  // NULL when this function is used from the compiler.
-  inline void LookupDescriptor(JSObject* holder,
-                               Name* name,
-                               LookupResult* result);
+  // Lookup in the map's instance descriptors and fill out the result if the
+  // name is found.
+  inline void LookupDescriptor(Name* name, LookupResult* result);
 
-  inline void LookupTransition(JSObject* holder, Name* name,
-                               PropertyAttributes attributes,
+  inline void LookupTransition(Name* name, PropertyAttributes attributes,
                                LookupResult* result);
 
   inline PropertyDetails GetLastDescriptorDetails();
 
   // The size of transition arrays are limited so they do not end up in large
   // object space. Otherwise ClearNonLiveTransitions would leak memory while
   // applying in-place right trimming.
   inline bool CanHaveMoreTransitions();
 
   int LastAdded() {
@@ skipping 4968 matching lines @@
     } else {
       value &= ~(1 << bit_position);
     }
     return value;
   }
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_OBJECTS_H_