RFR: Fix task queue assertion with traversal GC

[Roman Kennke]

Am 23.07.2018 um 18:00 schrieb Zhengyu Gu:
> The assertion may happen when traversal GC is cancelled.
> 
> Moved assertion to the end of cycle if it is completed without failure.
> 
> 
> Webrev:
> http://cr.openjdk.java.net/~zgu/shenandoah/traversal_tq_assert/webrev.00/
> 
> Test:
> 
>   tier3_gc_shenandoah fastdebug
> 
> Thanks,
> 
> -Zhengyu
> 

Ok. Thanks!
Roman