Store resolved library prefix in unresolved class object in order not to repeat

tests/language/src/FunctionTypeAlias4Test.dart

Index: tests/language/src/FunctionTypeAlias4Test.dart
===================================================================
--- tests/language/src/FunctionTypeAlias4Test.dart	(revision 0)
+++ tests/language/src/FunctionTypeAlias4Test.dart	(revision 0)
@@ -0,0 +1,36 @@
+// Copyright (c) 2011, 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 for function type alias with a type parameter as result type.
+
+typedef bool F<bool>(bool a);  // 'bool' is not the boolean type.
+
+bool bar(bool a) {
+}
+
+int baz(int a) {
+}
+
+class A<T> {
+  T foo(T a) {
+  }
+}
+
+main() {
+  Expect.isTrue(bar is F);
+  Expect.isTrue(baz is F);
+  Expect.isTrue(bar is F<bool>);
+  Expect.isTrue(baz is F<int>);
+  Expect.isTrue(bar is !F<int>);
+  Expect.isTrue(baz is !F<bool>);
+
+  var b = new A<bool>();
+  var i = new A<int>();
+  Expect.isTrue(b.foo is F);
+  Expect.isTrue(i.foo is F);
+  Expect.isTrue(b.foo is F<bool>);
+  Expect.isTrue(i.foo is F<int>);
+  Expect.isTrue(b.foo is !F<int>);
+  Expect.isTrue(i.foo is !F<bool>);
+}