Handle instance fields in compile_from_dill_test

pkg/compiler/lib/src/js_emitter/metadata_collector.dart

 // Copyright (c) 2013, 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.js_emitter.metadata_collector;
 
 import 'package:js_ast/src/precedence.dart' as js_precedence;
 
 import '../common.dart';
 import '../constants/values.dart';
@@ skipping 181 matching lines @@
   jsAst.Fun buildClassMetadataFunction(ClassEntity cls) {
     if (!_mirrorsData.mustRetainMetadata ||
         !_mirrorsData.isClassReferencedFromMirrorSystem(cls)) {
       return null;
     }
     // TODO(johnniwinther): Handle class entities.
     ClassElement element = cls;
     return _buildMetadataFunction(element);
   }
 
-  bool _mustEmitMetadataForMember(MemberElement element) {
-    return _mirrorsData.mustRetainMetadata &&
-        _mirrorsData.isMemberReferencedFromMirrorSystem(element);
+  bool _mustEmitMetadataForMember(MemberEntity member) {
+    if (!_mirrorsData.mustRetainMetadata) {
+      return false;
+    }
+    // TODO(johnniwinther): Handle member entities.
+    MemberElement element = member;
+    return _mirrorsData.isMemberReferencedFromMirrorSystem(element);
   }
 
-  jsAst.Fun buildFieldMetadataFunction(FieldElement element) {
-    if (!_mustEmitMetadataForMember(element)) return null;
+  jsAst.Fun buildFieldMetadataFunction(FieldEntity field) {
+    if (!_mustEmitMetadataForMember(field)) return null;
+    // TODO(johnniwinther): Handle field entities.
+    FieldElement element = field;
     return _buildMetadataFunction(element);
   }
 
   /// The metadata function returns the metadata associated with
   /// [element] in generated code.  The metadata needs to be wrapped
   /// in a function as it refers to constants that may not have been
   /// constructed yet.  For example, a class is allowed to be
   /// annotated with itself.  The metadata function is used by
   /// mirrors_patch to implement DeclarationMirror.metadata.
   jsAst.Fun _buildMetadataFunction(Element element) {
@@ skipping 246 matching lines @@
     if (token is _ForwardingMetadataEntry && !token.isBound) {
       _foundUnboundToken = true;
     }
   }
 
   bool findUnboundPlaceholders(jsAst.Node node) {
     node.accept(this);
     return _foundUnboundToken;
   }
 }