Add tests for generic methods in strong mode

tests/language_strong/generic_methods_bounds_test.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.
+
+// Test that a dynamic call to a generic function checks the type argument
+// against its bound.
+
+library generic_methods_bounds_test;
+
+import "package:expect/expect.dart";
+
+class A {}
+
+class B {}
+
+class C {
+  void fun<T extends A>(T t) {}
+}
+
+main() {
+  C c = new C();
+  c.fun<B>(new B()); /// 01: compile-time error
+
+  dynamic obj = new C();
+  obj.fun<B>(new B()); /// 02: runtime error
+}