Issue 29186. Make several top-level variables explicitly 'dynamic'.

tests/language_strong/inferrer_constructor3_test.dart

 // Copyright (c) 2013, 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.
 
 // Regression test for dart2js that used to optimistically infer the
 // wrong types for fields because of generative constructors being
 // inlined.
 
 import "package:expect/expect.dart";
 import "compiler_annotations.dart";
 
 class A {
   var field;
   A(this.field);
 }
 
-var c = () => new List(42)[0];
+dynamic c = () => new List(42)[0];
 
 main() {
   bar();
   // Defeat type inferencing.
   new A(c());
   doIt();
   bar();
 }
 
 @DontInline()
@@ skipping 17 matching lines @@
   return inlineLevel3();
 }
 
 inlineLevel3() {
   return inlineLevel4();
 }
 
 inlineLevel4() {
   return new A(42);
 }