kernel backend impact - noSuchMethod helpers are passed a Map literal

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

 // Copyright (c) 2015, 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.js_helpers.impact;
 
 import '../common/names.dart';
 import '../common_elements.dart' show CommonElements, ElementEnvironment;
 import '../elements/types.dart' show InterfaceType;
 import '../elements/entities.dart';
@@ skipping 206 matching lines @@
                 _commonElements.unresolvedTopLevelSetterError,
                 _commonElements.symbolConstructor,
               ]
             : [
                 _commonElements.throwNoSuchMethod,
               ],
         otherImpacts: [
           // Also register the types of the arguments passed to this method.
           _needsList(
               'Needed to encode the arguments for throw NoSuchMethodError.'),
-          _needsString('Needed to encode the name for throw NoSuchMethodError.')
+          _needsString(
+              'Needed to encode the name for throw NoSuchMethodError.'),
+          mapLiteralClass, // noSuchMethod helpers are passed a Map.
         ]);
   }
 
   BackendImpact _stringValues;
 
   BackendImpact get stringValues {
     return _stringValues ??=
         new BackendImpact(instantiatedClasses: [_commonElements.jsStringClass]);
   }
 
@@ skipping 549 matching lines @@
   /// Backend impact for type variables through mirrors.
   BackendImpact get typeVariableMirror {
     return _typeVariableMirror ??= new BackendImpact(staticUses: [
       _commonElements.typeVariableConstructor,
       _commonElements.createRuntimeType
     ], instantiatedClasses: [
       _commonElements.typeVariableClass
     ]);
   }
 }