Add support for 'throw' expression

pkg/kernel/testcases/interpreter/throw_simple_test.dart

Index: pkg/kernel/testcases/interpreter/throw_simple_test.dart
diff --git a/pkg/kernel/testcases/interpreter/throw_simple_test.dart b/pkg/kernel/testcases/interpreter/throw_simple_test.dart
new file mode 100644
index 0000000000000000000000000000000000000000..82328798b938b89d0bbe3bdc62529626ef47bdd1
--- /dev/null
+++ b/pkg/kernel/testcases/interpreter/throw_simple_test.dart
@@ -0,0 +1,7 @@
+// 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.
+
+main() {
+  throw 0;
+}