Make sure double to int conversion is correct.

src/elements.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 782 matching lines @@
           array->initialize_elements();
         } else {
           backing_store->set_length(length);
           Address filler_start = backing_store->address() +
               BackingStore::OffsetOfElementAt(length);
           int filler_size = (old_capacity - length) * ElementSize;
           array->GetHeap()->CreateFillerObjectAt(filler_start, filler_size);
         }
       } else {
         // Otherwise, fill the unused tail with holes.
-        int old_length = FastD2I(array->length()->Number());
+        int old_length = FastD2IChecked(array->length()->Number());
         for (int i = length; i < old_length; i++) {
           backing_store->set_the_hole(i);
         }
       }
       return length_object;
     }
 
     // Check whether the backing store should be expanded.
     uint32_t min = JSObject::NewElementsCapacity(old_capacity);
     uint32_t new_capacity = length > min ? length : min;
@@ skipping 867 matching lines @@
   if (!maybe_obj->To(&new_backing_store)) return maybe_obj;
   new_backing_store->set(0, length);
   { MaybeObject* result = array->SetContent(new_backing_store);
     if (result->IsFailure()) return result;
   }
   return array;
 }
 
 
 } }  // namespace v8::internal