Introduce WorldImpact

pkg/compiler/lib/src/js_backend/codegen/glue.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.
 
 library code_generator_dependencies;
 
 import '../js_backend.dart';
 import '../../dart2jslib.dart';
 import '../../js_emitter/js_emitter.dart';
 import '../../js/js.dart' as js;
@@ skipping 192 matching lines @@
                                            List<js.Expression> arguments) {
     int variableIndex = 0;
     js.Expression representation = _backend.rti.getTypeRepresentation(
         dartType,
         (_) => arguments[variableIndex++]);
     assert(variableIndex == arguments.length);
     return representation;
   }
 
   void registerIsCheck(DartType type, Registry registry) {
-    _enqueuer.registerIsCheck(type, registry);
+    _enqueuer.registerIsCheck(type);
     _backend.registerIsCheckForCodegen(type, _enqueuer, registry);
   }
 
   String getTypeTestTag(DartType type) {
     return _backend.namer.operatorIsType(type);
   }
 
   String getTypeSubstitutionTag(ClassElement element) {
     return _backend.namer.substitutionName(element);
   }
 
   bool operatorEqHandlesNullArgument(FunctionElement element) {
     return _backend.operatorEqHandlesNullArgument(element);
   }
 
   bool hasStrictSubtype(ClassElement element) {
     return _compiler.world.hasAnyStrictSubtype(element);
   }
 }