Add generic-methods 'golden' tests for 'reify' transformation

pkg/kernel/testcases/reify/generic_methods_shadowing_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 type parameters in generic methods can be shadowed.
+
+library generic_methods_shadowing_test;
+
+import "test_base.dart";
+
+class X {}
+
+class Y {}
+
+bool foo<T, S>(T t, S s) {
+
+  // The type parameter T of bar shadows the type parameter T of foo.
+  bool bar<T>(T t) {
+    return t is T && t is S;
+  }
+
+  return bar<S>(s);
+}
+
+main() {
+  expectTrue(foo<X, Y>(new X(), new Y()));
+}