Pretenure call new support.

test/mjsunit/allocation-site-info.js

 // 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 214 matching lines @@
   }
 
   // Case: new Array(length) as allocation site
   obj = newarraycase_length_smidouble(1);
   assertKind(elements_kind.fast_smi_only, obj);
   obj = newarraycase_length_smidouble(1.5);
   assertKind(elements_kind.fast_double, obj);
   obj = newarraycase_length_smidouble(2);
   assertKind(elements_kind.fast_double, obj);
 
-  // Try to continue the transition to fast object. This won't work for
-  // constructed arrays because constructor dispatch is done on the
-  // elements kind, and a DOUBLE array constructor won't create an allocation
-  // memento.
+  // Try to continue the transition to fast object.
+  // TODO(mvstanton): re-enable commented out code when
+  // FLAG_pretenuring_call_new is turned on in the build.
   obj = newarraycase_length_smidouble("coates");
   assertKind(elements_kind.fast, obj);
   obj = newarraycase_length_smidouble(2);
-  assertKind(elements_kind.fast_double, obj);
+  // assertKind(elements_kind.fast, obj);
 
   function newarraycase_length_smiobj(value) {
     var a = new Array(3);
     a[0] = value;
     return a;
   }
 
   // Case: new Array(<length>) as allocation site, smi->fast
   obj = newarraycase_length_smiobj(1);
   assertKind(elements_kind.fast_smi_only, obj);
@@ skipping 229 matching lines @@
     obj[0][0] = 3.5;
     obj[1][0][0] = "goodbye";
     assertKind(elements_kind.fast_double, obj[0]);
     assertKind(elements_kind.fast, obj[1][0]);
 
     obj = get_deep_nested_literal();
     assertKind(elements_kind.fast_double, obj[0]);
     assertKind(elements_kind.fast, obj[1][0]);
   })();
 }