Remove backends.

compiler/javatests/com/google/dart/compiler/backend/js/testUnaryDecIncExprOpt.dart

-// Copyright (c) 2011, 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.
-
-class Main {
-  static void main(int _marker_3) {
-    int _marker_0 = 0;
-
-    // Ensure that ++_marker_0 remains ++_marker_0 on simple assignment
-    int i = ++_marker_0;
-
-    // Ensure that _marker_1++ remains _marker_1++ when used in a for loop
-    for (int _marker_1 = 0; _marker_1 < 10; _marker_1++) {
-    }
-
-    // Ensure that --_marker_0 remains --_marker_0 on simple assignment
-    int j = --_marker_0;
-
-    // Ensure that _marker_2-- remains _marker_2-- when used in a for loop
-    for (int _marker_2 = 10; _marker_2 >= 0; _marker_2--) {
-    }
-
-    // Ensure that parameter _marker_3 remains as _marker_3++ 
-    _marker_3++;
-
-    // Ensure that parameter _marker_3 remains as --_marker_3
-    --_marker_3;
-
-    // Ensure binary op is inlined (variable).
-    int _marker_4;
-    i = ~_marker_4;
-
-    // Ensure binary op is inlined (parameter).
-    i = ~_marker_3;
-
-    // Ensure binary op is inlined (field).
-    A a = new A();
-    i = ~a.field_0;
-
-    // Ensure untyped operand is not inlined
-    var foo;
-    int _marker_5;
-    _marker_5 = ~foo;
-
-    // Ensure binary op is not inlined (abstract field).
-    A aa = new B();
-    i = ++aa.field_1;
-
-    // Ensure binary op is not inlined (abstract field).
-    A aaa = new B();
-    i = ++aaa.field_2;
-  }
-}
-
-class A {
-  A() { }
-  int field_0;
-  int field_1;
-  int field_2;
-}
-
-class B extends A {
-  B() : super() { }
-  int get field_1() { }
-  set field_2(x) { }
-}
-
-main() {
-  Main.main(0);
-}