Revert "Towards compiling Hello World!" and "Compile and run Hello World!"

pkg/compiler/lib/src/js_backend/constant_handler_javascript.dart

 // Copyright (c) 2014, 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 '../compile_time_constants.dart';
 import '../compiler.dart' show Compiler;
 import '../constants/constant_system.dart';
 import '../constants/expressions.dart';
 import '../constants/values.dart';
 import '../elements/elements.dart';
-import '../elements/entities.dart';
 import '../elements/visitor.dart' show BaseElementVisitor;
 import '../resolution/tree_elements.dart' show TreeElements;
 import '../tree/tree.dart';
 import 'constant_system_javascript.dart';
 
 /// [ConstantCompilerTask] for compilation of constants for the JavaScript
 /// backend.
 ///
 /// Since this task needs to distinguish between frontend and backend constants
 /// the actual compilation of the constants is forwarded to a
@@ skipping 87 matching lines @@
 
 /**
  * The [JavaScriptConstantCompiler] is used to keep track of compile-time
  * constants, initializations of global and static fields, and default values of
  * optional parameters for the JavaScript interpretation of constants.
  */
 class JavaScriptConstantCompiler extends ConstantCompilerBase
     implements BackendConstantEnvironment {
   // TODO(johnniwinther): Move this to the backend constant handler.
   /** Caches the statics where the initial value cannot be eagerly compiled. */
-  final Set<FieldEntity> lazyStatics = new Set<FieldEntity>();
+  final Set<FieldElement> lazyStatics = new Set<FieldElement>();
 
   // Constants computed for constant expressions.
   final Map<Node, ConstantExpression> nodeConstantMap =
       new Map<Node, ConstantExpression>();
 
   // Constants computed for metadata.
   // TODO(johnniwinther): Remove this when no longer used by
   // poi/forget_element_test.
   final Map<MetadataAnnotation, ConstantExpression> metadataConstantMap =
       new Map<MetadataAnnotation, ConstantExpression>();
 
   JavaScriptConstantCompiler(Compiler compiler)
       : super(compiler, JAVA_SCRIPT_CONSTANT_SYSTEM);
 
   ConstantExpression compileVariableWithDefinitions(
       VariableElement element, TreeElements definitions,
       {bool isConst: false, bool checkType: true}) {
     if (!isConst && lazyStatics.contains(element)) {
       return null;
     }
     ConstantExpression value = super.compileVariableWithDefinitions(
         element, definitions,
         isConst: isConst, checkType: checkType);
     if (!isConst && value == null) {
-      FieldElement field = element;
-      registerLazyStatic(field);
+      registerLazyStatic(element);
     }
     return value;
   }
 
   @override
-  void registerLazyStatic(FieldEntity element) {
+  void registerLazyStatic(FieldElement element) {
     lazyStatics.add(element);
   }
 
-  List<FieldEntity> getLazilyInitializedFieldsForEmission() {
-    return new List<FieldEntity>.from(lazyStatics);
+  List<FieldElement> getLazilyInitializedFieldsForEmission() {
+    return new List<FieldElement>.from(lazyStatics);
   }
 
   ConstantExpression compileNode(Node node, TreeElements elements,
       {bool enforceConst: true}) {
     return compileNodeWithDefinitions(node, elements, isConst: enforceConst);
   }
 
   ConstantExpression compileNodeWithDefinitions(
       Node node, TreeElements definitions,
       {bool isConst: true}) {
@@ skipping 60 matching lines @@
 class ForgetConstantNodeVisitor extends Visitor {
   final JavaScriptConstantCompiler constants;
 
   ForgetConstantNodeVisitor(this.constants);
 
   void visitNode(Node node) {
     node.visitChildren(this);
     constants.nodeConstantMap.remove(node);
   }
 }