Review request for JDK-8059346

[Attila Szegedi]

Please review JDK-8059346 at <http://cr.openjdk.java.net/~attila/8059346/webrev.00> for <https://bugs.openjdk.java.net/browse/JDK-8059346>

This patch allows classes representing obsolete code (overly optimistic code that got deoptimized) to get unloaded from memory. Example: with this patch box2d unloads 617 classes it didn't unload before.

Thanks,
  Attila.