Fix for issue 27199

pkg/compiler/lib/src/ssa/builder.dart

 // Copyright (c) 2012, 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.
 
 import 'dart:collection';
 
 import 'package:js_runtime/shared/embedded_names.dart';
 
 import '../closure.dart';
 import '../common.dart';
@@ skipping 3952 matching lines @@
     } else {
       reporter.internalError(
           type.element, 'Unexpected type variable in static context.');
       return null;
     }
   }
 
   HInstruction analyzeTypeArgument(DartType argument,
       {SourceInformation sourceInformation}) {
     assert(assertTypeInContext(argument));
+    argument = argument.unaliased;
     if (argument.treatAsDynamic) {
       // Represent [dynamic] as [null].
       return graph.addConstantNull(compiler);
     }
 
     if (argument.isTypeVariable) {
       return addTypeVariableReference(argument,
           sourceInformation: sourceInformation);
     }
 
@@ skipping 3839 matching lines @@
   const _LoopTypeVisitor();
   int visitNode(ast.Node node) => HLoopBlockInformation.NOT_A_LOOP;
   int visitWhile(ast.While node) => HLoopBlockInformation.WHILE_LOOP;
   int visitFor(ast.For node) => HLoopBlockInformation.FOR_LOOP;
   int visitDoWhile(ast.DoWhile node) => HLoopBlockInformation.DO_WHILE_LOOP;
   int visitAsyncForIn(ast.AsyncForIn node) => HLoopBlockInformation.FOR_IN_LOOP;
   int visitSyncForIn(ast.SyncForIn node) => HLoopBlockInformation.FOR_IN_LOOP;
   int visitSwitchStatement(ast.SwitchStatement node) =>
       HLoopBlockInformation.SWITCH_CONTINUE_LOOP;
 }