Add tests for generic methods in strong mode

tests/language_strong/generic_methods_recursive_bound_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 F-bounded quantification works for generic methods, and that types
+// that are passed to generic methods in dynamic calls are checked for being
+// recursively defined.
+
+library generic_methods_recursive_bound_test;
+
+import "package:expect/expect.dart";
+
+abstract class I<T> {
+  bool fun(T x);
+}
+
+void foo<T extends I<T>>(List<T> a) {
+  if (a.length > 1) {
+    a[0].fun(a[1]);
+  }
+}
+
+class C implements I<C> {
+  bool fun(C c) => true;
+}
+
+main() {
+  foo<C>(<C>[new C(), new C()]); /// 01: ok
+
+  dynamic bar = foo;
+  List<int> list2 = <int>[4, 2];
+  // The type int does not extend I<int>.
+  foo<int>(list2); /// 02: compile-time error
+  bar<int>(list2); /// 03: runtime error
+}