Don't type promote local functions.

pkg/front_end/lib/src/fasta/kernel/kernel_ast_factory.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:front_end/src/fasta/kernel/utils.dart';
 import 'package:front_end/src/fasta/scanner/token.dart' show Token;
 import 'package:front_end/src/fasta/type_inference/type_promotion.dart';
 import 'package:kernel/ast.dart';
 
 import '../builder/ast_factory.dart';
@@ skipping 223 matching lines @@
     return new KernelTypeLiteral(type);
   }
 
   @override
   VariableDeclaration variableDeclaration(
       String name, Token token, int functionNestingLevel,
       {DartType type,
       Expression initializer,
       Token equalsToken,
       bool isFinal: false,
-      bool isConst: false}) {
+      bool isConst: false,
+      bool isLocalFunction: false}) {
     return new KernelVariableDeclaration(name, functionNestingLevel,
         type: type,
         initializer: initializer,
         isFinal: isFinal,
-        isConst: isConst)
+        isConst: isConst,
+        isLocalFunction: isLocalFunction)
       ..fileOffset = offsetForToken(token)
       ..fileEqualsOffset = offsetForToken(equalsToken);
   }
 
   @override
   VariableGet variableGet(
       VariableDeclaration variable,
       TypePromotionFact<VariableDeclaration> fact,
       TypePromotionScope scope,
       Token token) {
     return new KernelVariableGet(variable, fact, scope)
       ..fileOffset = offsetForToken(token);
   }
 
   @override
   VariableSet variableSet(VariableDeclaration variable, Expression value) {
     return new KernelVariableSet(variable, value);
   }
 }