Migrate first block of tests in standalone to standalone_2

tests/standalone_2/int_list_test.dart

 // Copyright (c) 2014, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 //
 // Dart Mint representations and type propagation issue.
 // Testing Int32List and Uint32List loads.
 //
 // VMOptions=--optimization-counter-threshold=5 --no-use-osr --no-background-compilation
 
 import 'dart:typed_data';
 import "package:expect/expect.dart";
 
 main() {
   var a = new Uint32List(100);
   a[2] = 3;
   var res = sumIt1(a, 2);
   Expect.equals(3 * 10, res);
   res = sumIt1(a, 2);
   Expect.equals(3 * 10, res);
-  a = new Int32List(100);
-  a[2] = 3;
-  res = sumIt2(a, 2);
+  var a1 = new Int32List(100);
+  a1[2] = 3;
+  res = sumIt2(a1, 2);
   Expect.equals(3 * 10, res);
-  res = sumIt2(a, 2);
+  res = sumIt2(a1, 2);
   Expect.equals(3 * 10, res);
 }
 
 sumIt1(Uint32List a, int n) {
   var sum = 0;
   for (int i = 0; i < 10; i++) {
     sum += a[n];
   }
   return sum;
 }
 
 sumIt2(Int32List a, int n) {
   var sum = 0;
   for (int i = 0; i < 10; i++) {
     sum += a[n];
   }
   return sum;
 }