Add tests for list and async marker

pkg/compiler/lib/src/inferrer/builder_kernel.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.
 
 import 'package:kernel/ast.dart' as ir;
 
 import '../closure.dart';
 import '../common.dart';
 import '../compiler.dart';
 import '../elements/entities.dart';
@@ skipping 164 matching lines @@
         elementType = elementType == null
             ? types.allocatePhi(null, null, type, isTry: false)
             : types.addPhiInput(null, elementType, type);
         length++;
       }
       elementType = elementType == null
           ? types.nonNullEmpty()
           : types.simplifyPhi(null, null, elementType);
       TypeInformation containerType =
           listLiteral.isConst ? types.constListType : types.growableListType;
-      // TODO(efortuna): Change signature of allocateList and the rest of
-      // type_system to deal with Kernel elements.
       return types.allocateList(
           containerType, listLiteral, analyzedMember, elementType, length);
     });
   }
 
   @override
   TypeInformation visitReturnStatement(ir.ReturnStatement node) {
     ir.Node expression = node.expression;
     recordReturnType(
         expression == null ? types.nullType : expression.accept(this));
     locals.seenReturnOrThrow = true;
     initializationIsIndefinite();
     return null;
   }
 }