When reordering constructor initializers, use correct types for temp vars.

pkg/front_end/lib/src/fasta/kernel/kernel_shadow_ast.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.
 
 /// This file declares a "shadow hierarchy" of concrete classes which extend
 /// the kernel class hierarchy, adding methods and fields needed by the
 /// BodyBuilder.
 ///
 /// Instances of these classes may be created using the factory methods in
 /// `ast_factory.dart`.
@@ skipping 2081 matching lines @@
       : super(instrumentation, strongMode);
 
   @override
   AccessorNode createAccessorNode(KernelMember member) {
     AccessorNode accessorNode = new AccessorNode(this, member);
     member._accessorNode = accessorNode;
     return accessorNode;
   }
 
   @override
+  TypeInferrer createDisabledTypeInferrer() =>
+      new TypeInferrerDisabled(typeSchemaEnvironment);
+
+  @override
   KernelTypeInferrer createLocalTypeInferrer(
       Uri uri, TypeInferenceListener listener, InterfaceType thisType) {
     return new KernelTypeInferrer._(
         this, uri.toString(), listener, false, thisType, null);
   }
 
   @override
   MethodNode createMethodNode(KernelProcedure procedure) {
     MethodNode methodNode = new MethodNode(procedure);
     procedure._methodNode = methodNode;
@@ skipping 350 matching lines @@
   accept(v) => unsupported("accept", -1, null);
 
   accept1(v, arg) => unsupported("accept1", -1, null);
 
   getStaticType(types) => unsupported("getStaticType", -1, null);
 
   transformChildren(v) => unsupported("transformChildren", -1, null);
 
   visitChildren(v) => unsupported("visitChildren", -1, null);
 }