Begin writing tests of the runtime checks needed for Dart 2.0 soundness.

pkg/front_end/testcases/runtime_checks/dynamic_invocation_of_getter.dart

+// Copyright (c) 2017, 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.
+
+/*@testedFeatures=checks*/
+library test;
+
+class C {
+  dynamic f;
+  C(this.f);
+}
+
+void g(C c) {
+  c.f /*@checkCall=dynamic*/ (1.5);
+}
+
+void h(int i) {}
+void test() {
+  g(new C(h));
+}
+
+main() {}