Fixes #586 - enums should now work in SDK libs

lib/src/compiler/code_generator.dart

 // Copyright (c) 2015, 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.
 
 import 'dart:collection' show HashMap, HashSet;
 import 'dart:math' show min, max;
 
 import 'package:analyzer/analyzer.dart' hide ConstantEvaluator;
 import 'package:analyzer/dart/ast/ast.dart';
 import 'package:analyzer/dart/ast/token.dart' show Token, TokenType;
@@ skipping 1035 matching lines @@
 
     // Create static fields for each enum value
     for (var i = 0; i < fields.length; ++i) {
       result.add(js.statement('#.# = dart.const(new #(#));',
           [id, fields[i].name, id, js.number(i)]));
     }
 
     // Create static values list
     var values = new JS.ArrayInitializer(new List<JS.Expression>.from(
         fields.map((f) => js.call('#.#', [id, f.name]))));
+
+    // dart.constList helper internally depends on _interceptors.JSArray.
+    _declareBeforeUse(_jsArray);
+
     result.add(js.statement(
         '#.values = dart.constList(#, #);', [id, values, _emitType(type)]));
 
     return _statement(result);
   }
 
   /// Wraps a possibly generic class in its type arguments.
   JS.Statement _defineClassTypeArguments(TypeDefiningElement element,
       List<TypeParameterElement> formals, JS.Statement body) {
     assert(formals.isNotEmpty);
@@ skipping 3904 matching lines @@
 }
 
 bool isLibraryPrefix(Expression node) =>
     node is SimpleIdentifier && node.staticElement is PrefixElement;
 
 LibraryElement _getLibrary(AnalysisContext c, String uri) =>
     c.computeLibraryElement(c.sourceFactory.forUri(uri));
 
 bool _isDartRuntime(LibraryElement l) =>
     l.isInSdk && l.source.uri.toString() == 'dart:_runtime';