RFR: 8215097: Do not create NonJavaThreads before BarrierSet

[Kim Barrett]

> On Dec 10, 2018, at 4:59 PM, Kim Barrett <kim.barrett at oracle.com> wrote:
> 
>> On Dec 9, 2018, at 5:37 PM, Roman Kennke <rkennke at redhat.com> wrote:
>> Shenandoah also creates workers in constructors. May I request to hold
>> this off a little bit to avoid making a mess out of the very soon
>> upstream push? I'm open to moving this into initialize() but I cannot
>> tell real quick if it has or hasn't any funny side-effects.
> 
> Looks like Shenandoah has been pushed.

I’m planning to push tomorrow, unless there are objections.  That will give > 24 hours
for all the world’s overnight testing to pick up the Shenandoah integration.