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

test/mjsunit/array-splice.js

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+// Flags: --allow-natives-syntax
+
 // Check that splicing array of holes keeps it as array of holes
 (function() {
   for (var i = 0; i < 7; i++) {
     var array = new Array(10);
     var spliced = array.splice(1, 1, 'one', 'two');
     assertEquals(1, spliced.length);
     assertFalse(0 in spliced, "0 in spliced");
 
     assertEquals(11, array.length);
     assertFalse(0 in array, "0 in array");
@@ skipping 312 matching lines @@
     assertEquals([], spliced);
     assertEquals([1, 2, 3, 4], array);
   }
 })();
 
 
 // Check the behaviour when approaching maximal values for length.
 (function() {
   for (var i = 0; i < 7; i++) {
     try {
-      new Array(Math.pow(2, 32) - 3).splice(-1, 0, 1, 2, 3, 4, 5);
+      var a = %NormalizeElements([]);
+      a.length = Math.pow(2, 32) - 3;
+      a.splice(-1, 0, 1, 2, 3, 4, 5);
       throw 'Should have thrown RangeError';
     } catch (e) {
       assertTrue(e instanceof RangeError);
     }
 
     // Check smi boundary
     var bigNum = (1 << 30) - 3;
-    var array = new Array(bigNum);
+    var array = %NormalizeElements([]);
+    array.length = bigNum;
     array.splice(-1, 0, 1, 2, 3, 4, 5, 6, 7);
     assertEquals(bigNum + 7, array.length);
   }
 })();
 
 (function() {
   for (var i = 0; i < 7; i++) {
     var a = [7, 8, 9];
     a.splice(0, 0, 1, 2, 3, 4, 5, 6);
     assertEquals([1, 2, 3, 4, 5, 6, 7, 8, 9], a);
     assertFalse(a.hasOwnProperty(10), "a.hasOwnProperty(10)");
     assertEquals(undefined, a[10]);
   }
 })();