Add partial support for TryFinally and TryCatch statements

pkg/kernel/testcases/interpreter/try_catch_finally_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.
+
+main() {
+  try {
+    print('hello1');
+  } catch (e, _) {} finally {
+    print('hello2');
+  }
+  print('hello3');
+  print(foo());
+  print(bar());
+}
+
+int foo() {
+  try {
+    print('foo 1');
+    return 1;
+  } catch (e, _) {} finally {
+    print('foo 2');
+    return 2;
+  }
+}
+
+int bar() {
+  try {
+    print('bar 1');
+    return 1;
+  } catch (e, _) {} finally {
+    print('bar 2');
+  }
+  return 0;
+}