RFR: Backport JDK-8221435 and JDK-8221629

[Aleksey Shipilev]

On 5/15/19 9:25 PM, Roman Kennke wrote:
> Webrev:
> http://cr.openjdk.java.net/~rkennke/backport-jdk11-2019-05-15/webrev.00/

Looks okay. Feels like a risky backport, are we good on testing?

Metadata does not follow our "[backport] ..." format:
  8221435: Shenandoah should not mark through weak roots
  8221629: Shenandoah: Cleanup class unloading logic

Also here:

 460   // And finally finish class unloading
 461   if (_heap->unload_classes()) {
 462     _heap->unload_classes_and_cleanup_tables(full_gc);
 463   } else if (ShenandoahStringDedup::is_enabled()) {
 464     ShenandoahIsAliveSelector alive;
 465     BoolObjectClosure* is_alive = alive.is_alive_closure();
 466     ShenandoahStringDedup::unlink_or_oops_do(is_alive, NULL, false);
 467   }

Are we sure class unloading and strdedup are exclusive here?

-Aleksey