Move ResolutionEnqueuer.hasBeenResolved to Resolver

pkg/compiler/lib/src/resolution/resolution.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.resolution;
 
 import 'dart:collection' show Queue;
 
 import '../common.dart';
 import '../common/names.dart' show Identifiers;
@@ skipping 273 matching lines @@
           _isNativeClassOrExtendsNativeClass(enclosingClass)) {
         reporter.reportErrorMessage(tree, MessageKind.NO_SUCH_METHOD_IN_NATIVE);
       }
 
       resolution.target.resolveNativeMember(element, registry.impactBuilder);
 
       return registry.impactBuilder;
     });
   }
 
+  /// Returns `true` if [element] has been processed by the resolution enqueuer.
+  bool _hasBeenProcessed(MemberElement element) {
+    assert(invariant(element, element == element.analyzableElement.declaration,
+        message: "Unexpected element $element"));
+    return enqueuer.processedEntities.contains(element);
+  }
+
   WorldImpact resolveMethodElement(FunctionElementX element) {
     assert(invariant(element, element.isDeclaration));
     return reporter.withCurrentElement(element, () {
-      if (enqueuer.hasBeenProcessed(element)) {
+      if (_hasBeenProcessed(element)) {
         // TODO(karlklose): Remove the check for [isConstructor]. [elememts]
         // should never be non-null, not even for constructors.
         assert(invariant(element, element.isConstructor,
             message: 'Non-constructor element $element '
                 'has already been analyzed.'));
         return const ResolutionImpact();
       }
       if (element.isSynthesized) {
         if (element.isGenerativeConstructor) {
           ResolutionRegistry registry =
@@ skipping 454 matching lines @@
       if (member.isGenerativeConstructor && !member.isSynthesized) {
         reporter.reportErrorMessage(
             member, MessageKind.ILLEGAL_MIXIN_CONSTRUCTOR);
       } else {
         // Get the resolution tree and check that the resolved member
         // doesn't use 'super'. This is the part of the 'super' mixin
         // check that happens when a function is resolved before the
         // mixin application has been performed.
         // TODO(johnniwinther): Obtain the [TreeElements] for [member]
         // differently.
-        if (resolution.enqueuer.hasBeenProcessed(member)) {
+        if (_hasBeenProcessed(member)) {
           if (member.resolvedAst.kind == ResolvedAstKind.PARSED) {
             checkMixinSuperUses(
                 member.resolvedAst.elements, mixinApplication, mixin);
           }
         }
       }
     });
   }
 
   void checkMixinSuperUses(TreeElements elements,
@@ skipping 360 matching lines @@
   TreeElements get treeElements {
     assert(invariant(this, _treeElements != null,
         message: "TreeElements have not been computed for $this."));
     return _treeElements;
   }
 
   void reuseElement() {
     _treeElements = null;
   }
 }