Reland "Merge more Kernel infrastructure from kernel_sdk SDK fork."

tests/kernel/unsorted/closures_regression_test.dart

 // 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.
 
-import 'package:expect/expect.dart';
+import 'expect.dart';
 
+f(fun) => fun();
 class A {
-  noSuchMethod(im) => 42;
-}
-
-class B extends A {
-  noSuchMethod(im) => 87;
-
-  get foo => super.foo; /// 01: static type warning
+  identity(arg) {
+    return f(() {
+      print(this);
+      return f(() {
+        return this;
+      });
+    });
+  }
 }
 
 main() {
-  Expect.equals(42, new B().foo); /// 01: continued
-}
+  var a = new A();
+  Expect.isTrue(identical(a.identity(42), a));
+}