Allow classes shadowed by type variables to be referenced in static context

tests/language/src/TypeVariableStaticContextNegativeTest.dart

+// Copyright (c) 2012, 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.
+
+// A type variable can't be referenced in a static class
+
+class A<T> {
+  static int method() {
+    var foo = new T(); // error, can't reference a type variable in a static context
+  }
+}
+
+main() {
+   A.method(); 
+}