Keep new arrays allocated with 'new Array(N)' in fast mode

test/mjsunit/array-constructor-feedback.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 112 matching lines @@
     return new Array(len);
   }
   a = bar(10);
   a[0] = "a string";
   a = bar(10);
   assertKind(elements_kind.fast, a);
     %OptimizeFunctionOnNextCall(bar);
   a = bar(10);
   assertKind(elements_kind.fast, a);
   assertOptimized(bar);
-  a = bar(100000);
-  assertKind(elements_kind.dictionary, a);
+  bar(100000);
   assertOptimized(bar);
 
   // If the argument isn't a smi, things should still work.
   a = bar("oops");
   assertOptimized(bar);
   assertKind(elements_kind.fast, a);
 
   function barn(one, two, three) {
     return new Array(one, two, three);
   }
@@ skipping 66 matching lines @@
   a = bar(100);
   assertTrue(isHoley(a));
   a = bar(0);
   assertOptimized(bar);
   // Crankshafted functions don't use mementos, so feedback still
   // indicates a packed array is desired. (unless --nocrankshaft is in use).
   if (4 != %GetOptimizationStatus(bar)) {
     assertFalse(isHoley(a));
   }
 })();