Check for compile-time constants in DartCompiler

compiler/javatests/com/google/dart/compiler/backend/js/testFieldAccessExprOpt.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 A {
   int x;
 
-  static final A a = new A();
+  const A() : this.x = 1;
 
-  A(){}
+  static final A a = const A();

[ngeoffray, 2011/10/17 10:59:38]

Any reason for reordering the lines?

 }
 
 class WillNotOptimizeFieldAccess {
   WillNotOptimizeFieldAccess(){}
   int x;
 }
 
 class WillNotOptimizeFieldAccessSubclass extends WillNotOptimizeFieldAccess {
   WillNotOptimizeFieldAccessSubclass() : super() {}
   
@@ skipping 76 matching lines @@
 
     int _marker_7 = c.XGetter;
 
     int _marker_8 = c.AXGetter;
   }
 }
 
 main() {
   Main.main();
 }