Infra for running lib tests

test/codegen/lib/typed_data/typed_data_hierarchy_int64_test.dart

Index: test/codegen/lib/typed_data/typed_data_hierarchy_int64_test.dart
diff --git a/test/codegen/lib/typed_data/typed_data_hierarchy_int64_test.dart b/test/codegen/lib/typed_data/typed_data_hierarchy_int64_test.dart
new file mode 100644
index 0000000000000000000000000000000000000000..3b38bb6680e1ed5c1f8688b66b60ff1f90cca111
--- /dev/null
+++ b/test/codegen/lib/typed_data/typed_data_hierarchy_int64_test.dart
@@ -0,0 +1,29 @@
+// Copyright (c) 2013, 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.
+// VMOptions=--optimization-counter-threshold=10
+
+// Library tag to be able to run in html test framework.
+library typed_data_hierarchy_int64_test;
+
+import 'dart:typed_data';
+import 'package:expect/expect.dart';
+
+var inscrutable = null;
+
+void implementsTypedData() {
+  Expect.isTrue(inscrutable(new Int64List(1)) is TypedData);
+  Expect.isTrue(inscrutable(new Uint64List(1)) is TypedData);
+}
+
+void implementsList() {
+  Expect.isTrue(inscrutable(new Int64List(1)) is List<int>);
+  Expect.isTrue(inscrutable(new Uint64List(1)) is List<int>);
+}
+
+main() {
+  inscrutable = (x) => x;
+  implementsTypedData();
+  implementsList();
+}
+