Merge kernel closure conversion into the Dart SDK

pkg/kernel/testcases/closures/for_variable_capture_test.dart

Index: pkg/kernel/testcases/closures/for_variable_capture_test.dart
diff --git a/pkg/kernel/testcases/closures/for_variable_capture_test.dart b/pkg/kernel/testcases/closures/for_variable_capture_test.dart
new file mode 100644
index 0000000000000000000000000000000000000000..5efb362e33cead784c31f0fa4ff7a038a8e85246
--- /dev/null
+++ b/pkg/kernel/testcases/closures/for_variable_capture_test.dart
@@ -0,0 +1,15 @@
+// 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 file.
+
+main() {
+  var closure;
+  for (var i=0, fn = () => i; i < 3; i++) {
+    i += 1;
+    closure = fn;
+  }
+  var x = closure();
+  if (x != 1) {
+    throw "Expected 1, but got $x.";
+  }
+}