dart2js cps: Change rewriting of equality operators.

tests/compiler/dart2js/js_backend_cps_ir_control_flow_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.
 
 // Tests of control flow statements.
 
 library control_flow_tests;
 
 import 'js_backend_cps_ir.dart';
 
@@ skipping 39 matching lines @@
 
 main() {
   for (int i = 0; foo(true); i = foo(i)) {
     print(1);
     if (foo(false)) break;
   }
   print(2);
 }""", """
 function() {
   var i = 0;
-  while (P.identical(V.foo(true), true)) {
+  while (V.foo(true) === true) {
     P.print(1);
-    if (P.identical(V.foo(false), true))
+    if (V.foo(false) === true)
       break;
     i = V.foo(i);
   }
   P.print(2);
 }"""),
 const TestEntry("""
 foo(a) => a;
 
 main() {
  if (foo(true)) {
@@ skipping 98 matching lines @@
       H.throwConcurrentModificationError(xs);
     i = i + 1;
     i1 = i1 + 1;
   }
 }"""),
 ];
 
 void main() {
   runTests(tests);
 }