Handle call properties in is-checks.

tests/language/call_property_test.dart

Index: tests/language/call_property_test.dart
diff --git a/tests/language/call_property_test.dart b/tests/language/call_property_test.dart
new file mode 100644
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+++ b/tests/language/call_property_test.dart
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+// 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 class with a [call] property does not implement [Function] or
+// a typedef of function type.
+
+class Call {
+  int get call => 0;
+}
+
+typedef void F();
+
+main() {
+  Expect.isFalse(new Call() is Function);
+  Expect.isFalse(new Call() is F);
+}