Use mirror-free LRU test for dart2js

tests/compiler/dart2js_native/lru_test.dart

Index: tests/compiler/dart2js_native/lru_test.dart
diff --git a/tests/language/metadata_self_test.dart b/tests/compiler/dart2js_native/lru_test.dart
similarity index 63%
copy from tests/language/metadata_self_test.dart
copy to tests/compiler/dart2js_native/lru_test.dart
index 434cc38a0a0c2cc3aa81953b34b4cbdb7cd8abee..f5c5200269ec01324dc89096319549ad1e891cd8 100644
--- a/tests/language/metadata_self_test.dart
+++ b/tests/compiler/dart2js_native/lru_test.dart
@@ -2,13 +2,9 @@
 // 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 that metadata refer to the annotated declaration.
-
-@Foo()
-class Foo {
-  const Foo();
-}
+import "dart:_internal" show LRUMap;
+import "../../lib/mirrors/lru_expect.dart";
 
 main() {
-  Foo f = const Foo();
+  expect((shift) => new LRUMap.withShift(shift));
 }