Fix some of the negative language tests in preparation for implementing

tests/language/external_test.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.
+// VMOptions=--compile_all
 
 class Foo {
   var x;
   f() {}
 
   external var x01;  /// 01: compile-time error
   external int x02;  /// 02: compile-time error
 
   external f10();   /// 10: runtime error
   external f11() { }  /// 11: compile-time error
@@ skipping 33 matching lines @@
 
   // Try calling an unpatched external constructor.
   try {                                               /// 20: continued
     var foo = new Foo.n09();                          /// 20: continued
   } on String catch (exc) {                           /// 20: continued
     if (exc == "External implementation missing.") {  /// 20: continued
       throw exc;                                      /// 20: continued
     }                                                 /// 20: continued
   }                                                   /// 20: continued
 }