Eliminate redundant descriptor ElementTransitionAndStoreDescriptor.

src/ic/x64/ic-compiler-x64.cc

 // Copyright 2014 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.
 
 #include "src/v8.h"
 
 #if V8_TARGET_ARCH_X64
 
 #include "src/ic/ic.h"
 #include "src/ic/ic-compiler.h"
@@ skipping 87 matching lines @@
     }
   }
 
   Label number_case;
   Label* smi_target = IncludesNumberMap(maps) ? &number_case : &miss;
   __ JumpIfSmi(receiver(), smi_target);
 
   // Polymorphic keyed stores may use the map register
   Register map_reg = scratch1();
   DCHECK(kind() != Code::KEYED_STORE_IC ||
-         map_reg.is(ElementTransitionAndStoreDescriptor::MapRegister()));
+         map_reg.is(StoreTransitionDescriptor::MapRegister()));
   __ movp(map_reg, FieldOperand(receiver(), HeapObject::kMapOffset));
   int receiver_count = maps->length();
   int number_of_handled_maps = 0;
   for (int current = 0; current < receiver_count; ++current) {
     Handle<Map> map = maps->at(current);
     if (!map->is_deprecated()) {
       number_of_handled_maps++;
       Handle<WeakCell> cell = Map::WeakCellForMap(map);
       // Check map and tail call if there's a match
       __ CmpWeakValue(map_reg, cell, scratch2());
@@ skipping 14 matching lines @@
       number_of_handled_maps > 1 ? POLYMORPHIC : MONOMORPHIC;
   return GetCode(kind(), type, name, state);
 }
 
 
 #undef __
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_X64