RFR: Stop string dedup thread during VM shutdown

[Christine Flood]

This looks fine.

On Tue, Oct 31, 2017 at 11:17 AM, Zhengyu Gu <zgu at redhat.com> wrote:

> To be consistent with G1, stop string dedup thread during VM shutdown
>
> Webrev: http://cr.openjdk.java.net/~zgu/shenandoah/strdedup_stop_thr
> /webrev.00/
>
> Test:
>   hotspot_gc_shenandoah (fastdebug and release)
>
> Thanks,
>
> -Zhengyu
>