Make sure transitioned arrays efficiently call builtin Array functions

src/hydrogen.cc

Index: src/hydrogen.cc
diff --git a/src/hydrogen.cc b/src/hydrogen.cc
index 92308704328c7968176fbbe88fd392b58622207d..cd029748419031757471afb083b62052113313e6 100644
--- a/src/hydrogen.cc
+++ b/src/hydrogen.cc
@@ -1,4 +1,4 @@
-// Copyright 2011 the V8 project authors. All rights reserved.
+// 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:
@@ -4652,7 +4652,8 @@ void HGraphBuilder::AddCheckConstantFunction(Call* expr,
   // its prototypes.
   if (smi_and_map_check) {
     AddInstruction(new(zone()) HCheckNonSmi(receiver));
-    AddInstruction(new(zone()) HCheckMap(receiver, receiver_map));
+    AddInstruction(new(zone()) HCheckMap(receiver, receiver_map,
+                                         NULL, ALLOW_ELEMENT_TRANSITION_MAPS));
   }
   if (!expr->holder().is_null()) {
     AddInstruction(new(zone()) HCheckPrototypeMaps(