Fix shifting from holey arrays.

src/builtins.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 693 matching lines @@
   }
 
   int len = Smi::cast(array->length())->value();
   if (len == 0) return heap->undefined_value();
 
   // Get first element
   ElementsAccessor* accessor = array->GetElementsAccessor();
   Object* first;
   MaybeObject* maybe_first = accessor->Get(receiver, array, 0, elms_obj);
   if (!maybe_first->To(&first)) return maybe_first;
+  if (first->IsTheHole()) {
+    first = heap->undefined_value();
+  }
 
   if (!heap->lo_space()->Contains(elms_obj)) {
     array->set_elements(LeftTrimFixedArray(heap, elms_obj, 1));
   } else {
     // Shift the elements.
     if (elms_obj->IsFixedArray()) {
       FixedArray* elms = FixedArray::cast(elms_obj);
       AssertNoAllocation no_gc;
       MoveElements(heap, &no_gc, elms, 0, elms, 1, len - 1);
       elms->set(len - 1, heap->the_hole_value());
@@ skipping 1191 matching lines @@
   return Handle<Code>(code_address);                        \
 }
 BUILTIN_LIST_C(DEFINE_BUILTIN_ACCESSOR_C)
 BUILTIN_LIST_A(DEFINE_BUILTIN_ACCESSOR_A)
 BUILTIN_LIST_DEBUG_A(DEFINE_BUILTIN_ACCESSOR_A)
 #undef DEFINE_BUILTIN_ACCESSOR_C
 #undef DEFINE_BUILTIN_ACCESSOR_A
 
 
 } }  // namespace v8::internal