Add closure_test

tests/compiler/dart2js/closure/data/parameter_in_try.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.
+
+readInFinally(/*inTry*/ parameter) {
+  try {
+    if (parameter) {
+      throw '';
+    }
+  } finally {}
+}
+
+writeInFinally(/*inTry*/ parameter) {
+  try {
+    parameter = 42;
+    throw '';
+  } finally {}
+}
+
+main() {
+  readInFinally(null);
+  writeInFinally(null);
+}