Add test of unittests.

tests/compiler/dart2js/js_backend_cps_ir_operators2_test.dart

 // Copyright (c) 2015, 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.
 
 // Tests of operators.
 
-library operators_tests;
+library operators2_tests;
 
 import 'js_backend_cps_ir.dart';
 
 const List<TestEntry> tests = const [
 
   const TestEntry(r"""
 foo(a, b) => ((a & 0xff0000) >> 1) & b;
 main() {
   print(foo(123, 234));
   print(foo(0, 2));
@@ skipping 81 matching lines @@
 function(a) {
   var v0;
   return (a | 0) === a && (13 | 0) === 13 ? a / 13 | 0 : J.getInterceptor$n(v0 = a / 13).toInt$0(v0);
 }"""),
 
 ];
 
 void main() {
   runTests(tests);
 }