dart2js: Emit static const fields if accessible by reflections.

tests/lib/mirrors/static_const_field_test.dart

Index: tests/lib/mirrors/static_const_field_test.dart
diff --git a/tests/language/vm/reflect_core_vm_test.dart b/tests/lib/mirrors/static_const_field_test.dart
similarity index 54%
copy from tests/language/vm/reflect_core_vm_test.dart
copy to tests/lib/mirrors/static_const_field_test.dart
index 2474b216f7bf0b641535f0b18af4573eb9c7e723..f6fd959de34473e068f0c6434d1ab41e24014ab2 100644
--- a/tests/language/vm/reflect_core_vm_test.dart
+++ b/tests/lib/mirrors/static_const_field_test.dart
@@ -2,14 +2,17 @@
 // 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.
 
-// Test reflection of private functions in core classes.
+// Test that static const fields are accessible by reflection.
+// Regression test for http://dartbug.com/23811.
 
-import "package:expect/expect.dart";
+@MirrorsUsed(targets: const [A])
 import "dart:mirrors";
+import "package:expect/expect.dart";
 
-main() {
-  var s = "string";
-  var im = reflect(s);
-  Expect.throws(() => im.invoke(const Symbol("_setAt"), [0, 65]), (e) => e is NoSuchMethodError);
+class A {
+  static const ONE = 1;
 }
 
+main() {
+  Expect.equals(1, reflectClass(A).getField(#ONE).reflectee);
+}