Reapply "Implement an LRU cache in dart:_internal and use it for the getter/setter caches in the VM…

tests/compiler/dart2js_native/lru_test.dart

Index: tests/compiler/dart2js_native/lru_test.dart
diff --git a/tests/compiler/dart2js/path with spaces/file with spaces.dart b/tests/compiler/dart2js_native/lru_test.dart
similarity index 63%
copy from tests/compiler/dart2js/path with spaces/file with spaces.dart
copy to tests/compiler/dart2js_native/lru_test.dart
index b0cc20402f823946fa54730f2bb581c9bf58365a..f5c5200269ec01324dc89096319549ad1e891cd8 100644
--- a/tests/compiler/dart2js/path with spaces/file with spaces.dart	
+++ b/tests/compiler/dart2js_native/lru_test.dart
@@ -2,8 +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.
 
-import 'library space/lib with spaces.dart';
+import "dart:_internal" show LRUMap;
+import "../../lib/mirrors/lru_expect.dart";
 
 main() {
-  if (foo() != 499) throw "bad value";
+  expect((shift) => new LRUMap.withShift(shift));
 }