Add compile_from_dill test

pkg/compiler/lib/src/world.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 dart2js.world;
 
 import 'closure.dart' show ClosureClassElement, SynthesizedCallMethodElementX;
 import 'common.dart';
 import 'constants/constant_system.dart';
 import 'common_elements.dart' show CommonElements;
@@ skipping 1102 matching lines @@
       return getMightBePassedToApply(element.expression);
     }
     return _functionsThatMightBePassedToApply.contains(element);
   }
 
   @override
   bool getCurrentlyKnownMightBePassedToApply(Entity element) {
     return getMightBePassedToApply(element);
   }
 
   // TODO(johnniwinther): Support [cls] as a [ClassEntity].

[Siggi Cherem (dart-lang), 2017/05/30 22:34:42]

nit: move the TODO to the `if` below

[Johnni Winther, 2017/05/31 09:08:40]

Done.

   @override
-  String dump([ClassElement cls]) {
+  String dump([ClassEntity cls]) {
     StringBuffer sb = new StringBuffer();
     if (cls != null) {
       sb.write("Classes in the closed world related to $cls:\n");
     } else {
       sb.write("Instantiated classes in the closed world:\n");
     }
+    if (cls is! ClassElement) {

[Siggi Cherem (dart-lang), 2017/05/30 22:34:43]

should we just do this upfront instead?

[Johnni Winther, 2017/05/31 09:08:40]

Done.

+      cls = null;
+    }
     getClassHierarchyNode(commonElements.objectClass)
         .printOn(sb, ' ', instantiatedOnly: cls == null, withRespectTo: cls);
     return sb.toString();
   }
 }
 
 class ClosedWorldImpl extends ClosedWorldBase {
   ClosedWorldImpl(
       {CommonElements commonElements,
       ConstantSystem constantSystem,
@@ skipping 216 matching lines @@
   @override
   void registerClosureClass(ClassElement cls) {
     throw new UnimplementedError('KernelClosedWorld.registerClosureClass');
   }
 
   @override
   bool hasElementIn(ClassEntity cls, Selector selector, Entity element) {
     throw new UnimplementedError('KernelClosedWorld.hasElementIn');
   }
 }