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

test/mjsunit/polymorph-arrays.js

 // Copyright 2011 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 19 matching lines @@
   for (var i = 0; i < 10; ++i ){
     a[i] = i;
   }
 }
 
 function init_sparse_array(a) {
   for (var i = 0; i < 10; ++i ){
     a[i] = i;
   }
   a[5000000] = 256;
-  assertTrue(%HasDictionaryElements(a));
+  return %NormalizeElements(a);
 }
 
 function testPolymorphicLoads() {
   function make_polymorphic_load_function() {
     function load(a, i) {
       return a[i];
     }
 
     var object_array = new Object;
     var sparse_object_array = new Object;
     var js_array = new Array(10);
-    var sparse_js_array = new Array(5000001);
+    var sparse_js_array = %NormalizeElements([]);
 
     init_array(object_array);
     init_array(js_array);
     init_sparse_array(sparse_object_array);
     init_sparse_array(sparse_js_array);
 
     assertEquals(1, load(object_array, 1));
     assertEquals(1, load(js_array, 1));
     assertEquals(1, load(sparse_object_array, 1));
     assertEquals(1, load(sparse_js_array, 1));
 
     return load;
   }
 
   var object_array = new Object;
   var sparse_object_array = new Object;
   var js_array = new Array(10);
-  var sparse_js_array = new Array(5000001);
+  var sparse_js_array = %NormalizeElements([]);
 
   init_array(object_array);
   init_array(js_array);
   init_sparse_array(sparse_object_array);
   init_sparse_array(sparse_js_array);
 
   load = make_polymorphic_load_function();
   assertEquals(undefined, load(js_array, new Object()));
   load = make_polymorphic_load_function();
   assertEquals(undefined, load(object_array, new Object()));
@@ skipping 26 matching lines @@
 
 function testPolymorphicStores() {
   function make_polymorphic_store_function() {
     function store(a, i, val) {
       a[i] = val;
     }
 
     var object_array = new Object;
     var sparse_object_array = new Object;
     var js_array = new Array(10);
-    var sparse_js_array = new Array(5000001);
+    var sparse_js_array = [];
+    sparse_js_array.length = 5000001;
 
     init_array(object_array);
     init_array(js_array);
     init_sparse_array(sparse_object_array);
     init_sparse_array(sparse_js_array);
 
     store(object_array, 1, 256);
     store(js_array, 1, 256);
     store(sparse_object_array, 1, 256);
     store(sparse_js_array, 1, 256);
 
     return store;
   }
 
   var object_array = new Object;
   var sparse_object_array = new Object;
   var js_array = new Array(10);
-  var sparse_js_array = new Array(5000001);
+  var sparse_js_array = %NormalizeElements([]);
+  sparse_js_array.length = 5000001;
 
   init_array(object_array);
   init_array(js_array);
   init_sparse_array(sparse_object_array);
   init_sparse_array(sparse_js_array);
 
   store = make_polymorphic_store_function();
   store(object_array, 2, 257);
   store = make_polymorphic_store_function();
   store(js_array, 2, 257);
@@ skipping 22 matching lines @@
   store(sparse_js_array, 3, 258);
 
   assertEquals(258, object_array[3]);
   assertEquals(258, js_array[3]);
   assertEquals(258, sparse_js_array[3]);
   assertEquals(258, sparse_object_array[3]);
 }
 
 testPolymorphicLoads();
 testPolymorphicStores();