Omit write barrier when setting trimmed elements.

src/builtins.cc

 // Copyright 2006-2008 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 477 matching lines @@
   int len = Smi::cast(array->length())->value();
   if (len == 0) return Heap::undefined_value();
 
   // Get first element
   Object* first = elms->get(0);
   if (first->IsTheHole()) {
     first = Heap::undefined_value();
   }
 
   if (Heap::new_space()->Contains(elms)) {
-    array->set_elements(LeftTrimFixedArray(elms));
+    // As elms still in the same space they used to be (new space),
+    // there is no need to update remembered set.
+    array->set_elements(LeftTrimFixedArray(elms), SKIP_WRITE_BARRIER);
   } else {
     // Shift the elements.
     AssertNoAllocation no_gc;
     MoveElements(&no_gc, elms, 0, elms, 1, len - 1);
     elms->set(len - 1, Heap::the_hole_value());
   }
 
   // Set the length.
   array->set_length(Smi::FromInt(len - 1));
 
@@ skipping 959 matching lines @@
       if (entry->contains(pc)) {
         return names_[i];
       }
     }
   }
   return NULL;
 }
 
 
 } }  // namespace v8::internal