Set local function type as uninstantiated when applicable (fix issue 12127).

tests/language/function_subtype_local6_test.dart

Index: tests/language/function_subtype_local6_test.dart
===================================================================
--- tests/language/function_subtype_local6_test.dart	(revision 0)
+++ tests/language/function_subtype_local6_test.dart	(revision 0)
@@ -0,0 +1,17 @@
+// 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.
+// Dart test program for constructors and initializers.
+// VMOptions=--no-eliminate-type-checks
+
+// Regression test for issue 12127.
+
+class C<T> {
+  void test() {
+    void foo(T a) {}
+  }
+}
+
+main() {
+  new C<bool>().test();
+}