RFR: 8202813: Move vm_weak processing from SystemDictionary::do_unloading to WeakProcessor

[Kim Barrett]

> On May 22, 2018, at 8:27 PM, Kim Barrett <kim.barrett at oracle.com> wrote:
> 
>> On May 22, 2018, at 10:09 AM, Kim Barrett <kim.barrett at oracle.com> wrote:
>> New webrev:
>> http://cr.openjdk.java.net/~kbarrett/8202813/open.01/
> 
> I forgot to remove the no longer used is_alive argument for SystemDictionary::do_unloading.
> 
> Updated webrevs:
> full: http://cr.openjdk.java.net/~kbarrett/8202813/open.02/
> incr: http://cr.openjdk.java.net/~kbarrett/8202813/open.02.inc/

After some offline discussion, Coleen wants to take this in a somewhat different direction,
so I’m passing the baton off to her.