Do not resolve type arguments when only a resolved type class is needed to

tests/language/regress_16640_test.dart

Index: tests/language/regress_16640_test.dart
===================================================================
--- tests/language/regress_16640_test.dart	(revision 0)
+++ tests/language/regress_16640_test.dart	(revision 0)
@@ -0,0 +1,15 @@
+// Copyright (c) 2014, 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 issue 16640.
+
+class Segment extends SegmentGen { }
+
+class SegmentGen extends ConceptEntity<Segment> { }
+
+class ConceptEntity<E> { }
+
+main() {
+  new ConceptEntity<Segment>();
+}