Support serialization of WorldImpact

pkg/compiler/lib/src/cps_ir/cps_ir_builder_task.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.ir_builder_task;
 
 import '../closure.dart' as closure;
 import '../common.dart';
 import '../common/names.dart' show
     Identifiers,
@@ skipping 1350 matching lines @@
         assert(invariant(nativeBody,
             !nativeRedirectionRegExp.hasMatch(javaScriptCode),
           message: "Deprecated syntax, use @JSName('name') instead."));
         assert(invariant(nativeBody,
             function.functionSignature.parameterCount == 0,
             message: 'native "..." syntax is restricted to '
               'functions with zero parameters.'));
         irBuilder.buildNativeFunctionBody(function, javaScriptCode,
             sourceInformationBuilder.buildForeignCode(node));
       } else {
-        String name = backend.getFixedBackendName(function);
+        String name = backend.nativeData.getFixedBackendName(function);
         irBuilder.buildRedirectingNativeFunctionBody(function, name, source);
       }
     } else {
       irBuilder.buildReturn(
           value: build(node.expression),
           sourceInformation: source);
     }
   }
 
   visitSwitchStatement(ast.SwitchStatement node) {
@@ skipping 2869 matching lines @@
 
   bool isNative(ClassElement element) => _backend.isNative(element);
 
   bool isJsInterop(FunctionElement element) => _backend.isJsInterop(element);
 
   bool isJsInteropAnonymous(FunctionElement element) =>
     _backend.jsInteropAnalysis.hasAnonymousAnnotation(element.contextClass);
 
   String getJsInteropTargetPath(FunctionElement element) {
     return '${_backend.namer.fixedBackendPath(element)}.'
-      '${_backend.getFixedBackendName(element)}';
+      '${_backend.nativeData.getFixedBackendName(element)}';
   }
 
   DartType get jsJavascriptObjectType =>
     _backend.helpers.jsJavaScriptObjectClass.thisType;
 }