Introduce builtin for Array.slice function.

src/ic.cc

 // Copyright 2006-2009 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 437 matching lines @@
         return ReferenceError("not_defined", name);
       }
       return TypeError("undefined_method", object, name);
     }
   }
 
   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 Array.prototype.{push,pop}.
+    // 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
@@ skipping 926 matching lines @@
 #undef ADDR
 };
 
 
 Address IC::AddressFromUtilityId(IC::UtilityId id) {
   return IC_utilities[id];
 }
 
 
 } }  // namespace v8::internal