Add SSA instructions for reified type information

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 '../compiler.dart' show Compiler;
 import '../core_types.dart' show CoreClasses;
 import '../dart_types.dart' show InterfaceType;
 import '../elements/elements.dart' show ClassElement, Element;
@@ skipping 27 matching lines @@
 
   CoreClasses get coreClasses => compiler.coreClasses;
 
   BackendImpact _getRuntimeTypeArgument;
 
   BackendImpact get getRuntimeTypeArgument {
     if (_getRuntimeTypeArgument == null) {
       _getRuntimeTypeArgument = new BackendImpact(staticUses: [
         helpers.getRuntimeTypeArgument,
         helpers.getTypeArgumentByIndex,
-        helpers.copyTypeArguments
       ]);
     }
     return _getRuntimeTypeArgument;
   }
 
   BackendImpact _computeSignature;
 
   BackendImpact get computeSignature {
     if (_computeSignature == null) {
       _computeSignature = new BackendImpact(staticUses: [
@@ skipping 539 matching lines @@
   BackendImpact _closure;
 
   BackendImpact get closure {
     if (_closure == null) {
       _closure =
           new BackendImpact(instantiatedClasses: [coreClasses.functionClass]);
     }
     return _closure;
   }
 }