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

pkg/compiler/lib/src/kernel/kernel_backend_strategy.dart

 // Copyright (c) 2017, 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.kernel.backend_strategy;
 
 import 'package:kernel/ast.dart' as ir;
 
 import '../backend_strategy.dart';
 import '../closure.dart';
@@ skipping 55 matching lines @@
   @override
   WorkItemBuilder createCodegenWorkItemBuilder(ClosedWorld closedWorld) {
     return new KernelCodegenWorkItemBuilder(_compiler.backend, closedWorld);
   }
 
   @override
   CodegenWorldBuilder createCodegenWorldBuilder(
       NativeBasicData nativeBasicData,
       ClosedWorld closedWorld,
       SelectorConstraintsStrategy selectorConstraintsStrategy) {
-    KernelFrontEndStrategy frontendStrategy = _compiler.frontendStrategy;
-    return new KernelCodegenWorldBuilder(
-        frontendStrategy.elementMap,
-        closedWorld.elementEnvironment,
-        nativeBasicData,
-        closedWorld,
-        selectorConstraintsStrategy);
+    return new KernelCodegenWorldBuilder(closedWorld.elementEnvironment,
+        nativeBasicData, closedWorld, selectorConstraintsStrategy);
   }
 
   @override
   SsaBuilderTask createSsaBuilderTask(JavaScriptBackend backend,
       SourceInformationStrategy sourceInformationStrategy) {
     return new KernelSsaBuilderTask(backend.compiler);
   }
 
   @override
   SourceInformationStrategy get sourceInformationStrategy =>
@@ skipping 22 matching lines @@
   }
 }
 
 class KernelCodegenWorkItem extends CodegenWorkItem {
   final JavaScriptBackend _backend;
   final ClosedWorld _closedWorld;
   final MemberEntity element;
   final CodegenRegistry registry;
 
   KernelCodegenWorkItem(this._backend, this._closedWorld, this.element)
-      : registry =
-            new CodegenRegistry(_closedWorld.elementEnvironment, element);
+      : registry = new CodegenRegistry(element);
 
   @override
   WorldImpact run() {
     return _backend.codegen(this, _closedWorld);
   }
 }
 
 /// Task for building SSA from kernel IR loaded from .dill.
 class KernelSsaBuilderTask extends CompilerTask implements SsaBuilderTask {
   final Compiler _compiler;
@@ skipping 128 matching lines @@
   }
 
   @override
   void leaveInlinedMember(MemberEntity member) {
     assert(member == currentMember);
     _members.removeLast();
   }
 
   @override
   JumpTarget getJumpTarget(ir.TreeNode node, {bool isContinueTarget: false}) {
-    // TODO(johnniwinther): Support jump targets.
-    return null;
+    throw new UnimplementedError('KernelToLocalsMapImpl.getJumpTarget');
   }
 
   @override
   Local getLocal(ir.VariableDeclaration node) {
     return _map.putIfAbsent(node, () {
       return new KLocal(node.name, currentMember);
     });
   }
 
   @override
@@ skipping 118 matching lines @@
   Iterable<ClassEntity> sortClasses(Iterable<ClassEntity> classes) {
     return classes.toList()
       ..sort((ClassEntity a, ClassEntity b) {
         int r = _compareLibraries(a.library, b.library);
         if (r != 0) return r;
         return _compareNodes(
             a, elementMap.getClassNode(a), b, elementMap.getClassNode(b));
       });
   }
 }