Reland 4068 which wrapped Array methods into native builtins (reverted in 4075).

src/ic.cc

Index: src/ic.cc
diff --git a/src/ic.cc b/src/ic.cc
index f82e61e47b9cd0328eff919c2a462c84bb37c084..e87fd750cba8276bf00bc40caa11f71670fb7628 100644
--- a/src/ic.cc
+++ b/src/ic.cc
@@ -458,17 +458,6 @@ Object* CallIC::LoadFunction(State state,
   ASSERT(result != Heap::the_hole_value());
 
   if (result->IsJSFunction()) {
-    // Check if there is an optimized (builtin) version of the function.
-    // Ignored this will degrade performance for some Array functions.
-    // Please note we only return the optimized function iff
-    // the JSObject has FastElements.
-    if (object->IsJSObject() && JSObject::cast(*object)->HasFastElements()) {
-      Object* opt = Top::LookupSpecialFunction(JSObject::cast(*object),
-                                               lookup.holder(),
-                                               JSFunction::cast(result));
-      if (opt->IsJSFunction()) return opt;
-    }
-
 #ifdef ENABLE_DEBUGGER_SUPPORT
     // Handle stepping into a function if step into is active.
     if (Debug::StepInActive()) {