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

test/mjsunit/elements-kind.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 127 matching lines @@
   for (var i = 0; i < 1337; i++) {
     var val = i;
     if (i == 1336) {
       assertKind(elements_kind.fast_smi_only, you);
       val = new Object();
     }
     you[i] = val;
   }
   assertKind(elements_kind.fast, you);
 
-  assertKind(elements_kind.dictionary, new Array(0xDECAF));
+  var temp = [];
+  temp[0xDECAF] = 0;
+  assertKind(elements_kind.dictionary, temp);
 
   var fast_double_array = new Array(0xDECAF);
   for (var i = 0; i < 0xDECAF; i++) fast_double_array[i] = i / 2;
   assertKind(elements_kind.fast_double, fast_double_array);
 
   assertKind(elements_kind.fixed_int8,    new Int8Array(007));
   assertKind(elements_kind.fixed_uint8,   new Uint8Array(007));
   assertKind(elements_kind.fixed_int16,   new Int16Array(666));
   assertKind(elements_kind.fixed_uint16,  new Uint16Array(42));
   assertKind(elements_kind.fixed_int32,   new Int32Array(0xF));
@@ skipping 216 matching lines @@
 // Test that Array.splice() and Array.slice() return correct ElementsKinds.
 var a = ["foo", "bar"];
 assertKind(elements_kind.fast, a);
 var b = a.splice(0, 1);
 assertKind(elements_kind.fast, b);
 var c = a.slice(0, 1);
 assertKind(elements_kind.fast, c);
 
 // Throw away type information in the ICs for next stress run.
 gc();