Fix another closure/type variable error by using analyzeTypeVariables.

tests/language/issue14014_2_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.
+
+// Test that a type variable used in a parameter of a constructor that
+// has a closure in its initializer list does not lead to a crash in
+// dart2js.
+
+class A<T> {
+  A(f);
+}
+
+class B<T> extends A<T> {
+  B({void f(T foo)}) : super((T a) { f = (a) => 42;});
+}
+
+main() {
+  var t = new B<int>();
+}