Revert r31212. Some tests fail.

tests/compiler/dart2js/side_effect_tdiv_regression_test.dart

Index: tests/compiler/dart2js/side_effect_tdiv_regression_test.dart
===================================================================
--- tests/compiler/dart2js/side_effect_tdiv_regression_test.dart	(revision 31214)
+++ tests/compiler/dart2js/side_effect_tdiv_regression_test.dart	(working copy)
@@ -1,30 +0,0 @@
-// Copyright (c) 2013, 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.
-
-import 'package:expect/expect.dart';
-import "package:async_helper/async_helper.dart";
-
-import 'compiler_helper.dart';
-import 'parser_helper.dart';
-
-const String TEST = r'''
-class A {
-  var field = 42;
-}
-main() {
-  var a = new A();
-  var b = [42, -1];
-  // Force a setter on [field].
-  if (false) a.field = 12;
-  var c = a.field;
-  print(b[0] ~/ b[1]);
-  return c + a.field;
-}
-''';
-
-void main() {
-  asyncTest(() => compileAll(TEST).then((generated) {
-    Expect.isTrue(generated.contains('return c + c;'));
-  }));  
-}