Avoid converting key to string for deleting of elements

src/objects.cc

 // Copyright 2013 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 <iomanip>
 #include <sstream>
 
 #include "src/v8.h"
 
 #include "src/accessors.h"
@@ skipping 5212 matching lines @@
     }
   }
 
   return it->factory()->true_value();
 }
 
 
 MaybeHandle<Object> JSReceiver::DeleteElement(Handle<JSReceiver> object,
                                               uint32_t index,
                                               LanguageMode language_mode) {
-  LookupIterator it(object->GetIsolate(), object, index);
+  LookupIterator it(object->GetIsolate(), object, index,
+                    LookupIterator::HIDDEN);
   return DeleteProperty(&it, language_mode);
 }
 
 
 MaybeHandle<Object> JSReceiver::DeleteProperty(Handle<JSReceiver> object,
                                                Handle<Name> name,
                                                LanguageMode language_mode) {
   LookupIterator it(object, name, LookupIterator::HIDDEN);
   return JSObject::DeleteProperty(&it, language_mode);
 }
@@ skipping 10857 matching lines @@
                                             Handle<Object> new_value) {
   if (cell->value() != *new_value) {
     cell->set_value(*new_value);
     Isolate* isolate = cell->GetIsolate();
     cell->dependent_code()->DeoptimizeDependentCodeGroup(
         isolate, DependentCode::kPropertyCellChangedGroup);
   }
 }
 }  // namespace internal
 }  // namespace v8