Add ElementCodegenWorldBuilder

pkg/compiler/lib/src/js_backend/resolution_listener.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 js_backend.backend.resolution_listener;
 
 import '../common/names.dart' show Identifiers, Uris;
 import '../common_elements.dart' show CommonElements, ElementEnvironment;
 import '../constants/values.dart';
 import '../deferred_load.dart';
@@ skipping 135 matching lines @@
     _backendUsage.processBackendImpact(_impacts.isolateSupport);
     _impacts.isolateSupportForResolution
         .registerImpact(impactBuilder, _elementEnvironment);
     _backendUsage.processBackendImpact(_impacts.isolateSupportForResolution);
     return impactBuilder;
   }
 
   /// Computes the [WorldImpact] of calling [mainMethod] as the entry point.
   WorldImpact _computeMainImpact(FunctionEntity mainMethod) {
     WorldImpactBuilderImpl mainImpact = new WorldImpactBuilderImpl();
-    ParameterStructure parameterStructure = mainMethod.parameterStructure;
-    CallStructure callStructure = new CallStructure(
-        parameterStructure.positionalParameters +
-            parameterStructure.namedParameters.length,
-        parameterStructure.namedParameters);
+    CallStructure callStructure = mainMethod.parameterStructure.callStructure;
     if (callStructure.argumentCount > 0) {
       _impacts.mainWithArguments
           .registerImpact(mainImpact, _elementEnvironment);
       _backendUsage.processBackendImpact(_impacts.mainWithArguments);
       mainImpact.registerStaticUse(
           new StaticUse.staticInvoke(mainMethod, callStructure));
       // If the main method takes arguments, this compilation could be the
       // target of Isolate.spawnUri. Strictly speaking, that can happen also if
       // main takes no arguments, but in this case the spawned isolate can't
       // communicate with the spawning isolate.
@@ skipping 332 matching lines @@
     }
     _registerBackendImpact(
         impactBuilder, new BackendImpact(globalUses: staticUses));
   }
 
   @override
   void logSummary(void log(String message)) {
     _nativeEnqueuer.logSummary(log);
   }
 }