RFR: 8209976: Improve iteration over non-JavaThreads

[coleen.phillimore at oracle.com]

This looks like a good improvement.  So there are either JavaThreads or 
NonJavaThreads but no Thread now?   Should Thread be made abstract so it 
cannot be instantiated?

thanks,
Coleen

On 8/27/18 1:34 PM, Kim Barrett wrote:
>> On Aug 27, 2018, at 12:09 PM, Kim Barrett <kim.barrett at oracle.com> wrote:
>> Hm, except that I seem to have forgotten to remove the
>> now obsolete asserts from GlobalCounter::critical_section_begin/end.
> New webrevs:
> full: http://cr.openjdk.java.net/~kbarrett/8209976/open.01/
> incr: http://cr.openjdk.java.net/~kbarrett/8209976/open.01.inc/
>
>