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

pkg/kernel/testcases/reify/generic_methods_simple_as_expression_error_test.dart

Index: pkg/kernel/testcases/reify/generic_methods_simple_as_expression_error_test.dart
diff --git a/pkg/kernel/testcases/reify/generic_methods_simple_as_expression_error_test.dart b/pkg/kernel/testcases/reify/generic_methods_simple_as_expression_error_test.dart
new file mode 100644
index 0000000000000000000000000000000000000000..1b89821a96ae2279ed3fc66acf0a3c5eef99b36f
--- /dev/null
+++ b/pkg/kernel/testcases/reify/generic_methods_simple_as_expression_error_test.dart
@@ -0,0 +1,18 @@
+// 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 used in as-expressions,
+// and that an exception is thrown if the cast can't be made.
+
+library generic_methods_simple_as_expression_error_test;
+
+import "test_base.dart";
+
+T cast<T>(dynamic obj) {
+  return obj as T;
+}
+
+main() {
+  expectThrows(() => cast<String>(42), (e) => e is CastError);
+}