Fix type inference of factory constructor invocations.

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/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 168 matching lines @@
   }
 
   @override
   StaticGet staticGet(Member readTarget, Token token) {
     return new KernelStaticGet(readTarget)..fileOffset = offsetForToken(token);
   }
 
   @override
   StaticInvocation staticInvocation(Procedure target, Arguments arguments,
       {bool isConst: false}) {
+    if (target.kind == ProcedureKind.Factory) {
+      return new KernelFactoryConstructorInvocation(target, arguments,
+          isConst: isConst);
+    }
     return new KernelStaticInvocation(target, arguments, isConst: isConst);
   }
 
   @override
   StringConcatenation stringConcatenation(
       List<Expression> expressions, Token token) {
     return new KernelStringConcatenation(expressions)
       ..fileOffset = offsetForToken(token);
   }
 
@@ skipping 62 matching lines @@
       Token token) {
     return new KernelVariableGet(variable, fact, scope)
       ..fileOffset = offsetForToken(token);
   }
 
   @override
   VariableSet variableSet(VariableDeclaration variable, Expression value) {
     return new KernelVariableSet(variable, value);
   }
 }