RFR: Make Shenandoah to use ShenandoahOWST only

[Aleksey Shipilev]

On 10/01/2018 05:46 PM, Zhengyu Gu wrote:
> This patch to remove UseShenandoahOWST experimental flag and have Shenandoah to use OWST termination
> protocol only.
> 
> ShenandoahOWST has been enabled shortly after it was introduced, it is well tested, let's eliminate
> the flag and purge fallback branch. This also reverts some of upstream changes.
> 
> 
> Webrev: http://cr.openjdk.java.net/~zgu/shenandoah/sh-owst/webrev.00/index.html

Looks good.

Nits:

*) Please align L913 argument:

 912   ShenandoahTraversalRefProcTaskProxy(AbstractRefProcTaskExecutor::ProcessTask& proc_task,
 913                              ShenandoahTaskTerminator* t) :


Thanks,
-Aleksey