fix special index parsing

test/mjsunit/harmony/typedarrays.js

 // Copyright 2013 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 512 matching lines @@
   a[s2] = 255;
   assertEquals(undefined, a["-0"]);
   assertEquals(255, a[s2]);
   assertEquals(0, a[-0]);
 
   /* Chromium bug: 424619
    * a[-Infinity] = 50;
    * assertEquals(undefined, a[-Infinity]);
    */
   a[1.5] = 10;
-  assertEquals(10, a[1.5]);
+  assertEquals(undefined, a[1.5]);
   var nan = Math.sqrt(-1);
   a[nan] = 5;
   assertEquals(5, a[nan]);
 
   var x = 0;
   var y = -0;
   assertEquals(Infinity, 1/x);
   assertEquals(-Infinity, 1/y);
   a[x] = 5;
   a[y] = 27;
@@ skipping 28 matching lines @@
   a[s2] = 255;
   assertEquals(undefined, a["-0"]);
   assertEquals(255, a[s2]);
   assertEquals(0, a[-0]);
 
   /* Chromium bug: 424619
    * a[-Infinity] = 50;
    * assertEquals(undefined, a[-Infinity]);
    */
   a[1.5] = 10;
-  assertEquals(10, a[1.5]);
+  assertEquals(undefined, a[1.5]);
   var nan = Math.sqrt(-1);
   a[nan] = 5;
   assertEquals(5, a[nan]);
 
   var x = 0;
   var y = -0;
   assertEquals(Infinity, 1/x);
   assertEquals(-Infinity, 1/y);
   a[x] = 5;
   a[y] = 27;
@@ skipping 119 matching lines @@
 TestArbitrary(new ArrayBuffer(256));
 for(i = 0; i < typedArrayConstructors.length; i++) {
   TestArbitrary(new typedArrayConstructors[i](10));
 }
 TestArbitrary(new DataView(new ArrayBuffer(256)));
 
 
 // Test direct constructor call
 assertThrows(function() { ArrayBuffer(); }, TypeError);
 assertThrows(function() { DataView(new ArrayBuffer()); }, TypeError);