Improve resolution/codegen separation invariant.

pkg/compiler/lib/src/enqueue.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.
 
 part of dart2js;
 
 typedef ItemCompilationContext ItemCompilationContextCreator();
 
 class EnqueueTask extends CompilerTask {
   final ResolutionEnqueuer resolution;
@@ skipping 835 matching lines @@
 
     if (compiler.hasIncrementalSupport && !isProcessed(element)) {
       newlyEnqueuedElements.add(element);
     }
 
     if (queueIsClosed) {
       throw new SpannableAssertionFailure(element,
           "Codegen work list is closed. Trying to add $element");
     }
     CodegenWorkItem workItem = new CodegenWorkItem(
-        element, itemCompilationContextCreator());
+        compiler, element, itemCompilationContextCreator());
     queue.add(workItem);
     return true;
   }
 
   void registerNoSuchMethod(Element element) {
     if (!enabledNoSuchMethod && compiler.backend.enabledNoSuchMethod) {
       compiler.backend.enableNoSuchMethod(this);
       enabledNoSuchMethod = true;
     }
   }
@@ skipping 42 matching lines @@
   void processWorkItem(void f(WorkItem work), WorkItem work) {
     f(work);
   }
 }
 
 void removeFromSet(Map<String, Set<Element>> map, Element element) {
   Set<Element> set = map[element.name];
   if (set == null) return;
   set.remove(element);
 }