Handle type variable test and typed list literal.

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 238 matching lines @@
         sourceInformationBuilder.buildVariableDeclaration();
     localsHandler = new LocalsHandler(
         this,
         target,
         target.memberContext,
         target.contextClass,
         null,
         closedWorld.nativeData,
         closedWorld.interceptorData);
     loopHandler = new SsaLoopHandler(this);
-    typeBuilder = new TypeBuilderImpl(this);
+    typeBuilder = new TypeBuilder(this);
   }
 
   MemberElement get targetElement => target;
 
   /// Reference to resolved elements in [target]'s AST.
   TreeElements get elements => resolvedAst.elements;
 
   @override
   SemanticSendVisitor get sendVisitor => this;
 
@@ skipping 6576 matching lines @@
       this.oldReturnLocal,
       this.oldReturnType,
       this.oldResolvedAst,
       this.oldStack,
       this.oldLocalsHandler,
       this.inTryStatement,
       this.allFunctionsCalledOnce,
       this.oldElementInferenceResults)
       : super(function);
 }
-
-class TypeBuilderImpl extends TypeBuilder {
-  TypeBuilderImpl(GraphBuilder builder) : super(builder);
-
-  @override
-  InterfaceType getThisType(covariant ClassElement cls) {
-    return cls.thisType;
-  }
-}