Type check try statements

tests/compiler/dart2js/mock_compiler.dart

 // Copyright (c) 2012, 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.
 
 library mock_compiler;
 
 import "package:expect/expect.dart";
 import 'dart:collection';
 import 'dart:uri';
 
@@ skipping 140 matching lines @@
     static var NAN = 0;
     static parse(s) {}
   }
   class bool {}
   class String implements Pattern {}
   class Object {
     operator ==(other) { return true; }
     String toString() { return null; }
     noSuchMethod(im) { throw im; }
   }
+  abstract class StackTrace {}
   class Type {}
   class Function {}
   class List<E> {}
   abstract class Map<K,V> {}
   class DateTime {
     DateTime(year);
     DateTime.utc(year);
   }
   abstract class Pattern {}
   bool identical(Object a, Object b) { return true; }''';
@@ skipping 250 matching lines @@
   }
 }
 
 class MockDeferredLoadTask extends DeferredLoadTask {
   MockDeferredLoadTask(Compiler compiler) : super(compiler);
 
   void registerMainApp(LibraryElement mainApp) {
     // Do nothing.
   }
 }