Avoid eager enqueueing from resolution

pkg/compiler/lib/src/common/codegen.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.common.codegen;
 
 import '../compiler.dart' show
     Compiler;
 import '../constants/values.dart' show
     ConstantValue;
@@ skipping 173 matching lines @@
 
   factory CodegenWorkItem(
       Compiler compiler,
       AstElement element,
       ItemCompilationContext compilationContext) {
     // If this assertion fails, the resolution callbacks of the backend may be
     // missing call of form registry.registerXXX. Alternatively, the code
     // generation could spuriously be adding dependencies on things we know we
     // don't need.
     assert(invariant(element,
-        compiler.enqueuer.resolution.hasBeenResolved(element),
+        compiler.enqueuer.resolution.hasBeenProcessed(element),
         message: "$element has not been resolved."));
     assert(invariant(element, element.resolvedAst.elements != null,
         message: 'Resolution tree is null for $element in codegen work item'));
     return new CodegenWorkItem.internal(element, compilationContext);
   }
 
   CodegenWorkItem.internal(
       AstElement element,
       ItemCompilationContext compilationContext)
       : super(element, compilationContext);
 
   TreeElements get resolutionTree => element.resolvedAst.elements;
 
   WorldImpact run(Compiler compiler, CodegenEnqueuer world) {
     if (world.isProcessed(element)) return const WorldImpact();
 
     registry = new CodegenRegistry(compiler, resolutionTree);
     return compiler.codegen(this, world);
   }
 }