Merge kernel closure conversion into the Dart SDK

pkg/kernel/testcases/closures/capture_closure.dart

Index: pkg/kernel/testcases/closures/capture_closure.dart
diff --git a/pkg/kernel/testcases/closures/capture_closure.dart b/pkg/kernel/testcases/closures/capture_closure.dart
new file mode 100644
index 0000000000000000000000000000000000000000..cdfadf51b4b78af445b50514d8236a1b60aaffb3
--- /dev/null
+++ b/pkg/kernel/testcases/closures/capture_closure.dart
@@ -0,0 +1,9 @@
+// Copyright (c) 2016, 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.md file.
+
+main(arguments) {
+  f() => null;
+  g() => f();
+  g();
+}