Fix issue 22800: Unreachable exception handlers do not have their handler types initialized. Initia…

tests/language/issue22800_test.dart

+// Copyright (c) 2015, 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.
+
+// Check proper exception handler finalization, even for unreachable handlers.
+
+void main() {
+  try {
+    print("Starting here");
+    throw 0;
+    try {
+    } catch (e) {
+    }
+  } catch (e) {
+    print("Caught in here: $e");
+  }
+  try {
+  } catch (e) {
+  }
+}