RFR 8230483: Shenandoah: Shenandoah assert_correct failed; Object klass pointer should not be NULL

[Zhengyu Gu]

Thanks for reviewing.

On 9/3/19 1:00 PM, Aleksey Shipilev wrote:
> On 9/3/19 6:56 PM, Zhengyu Gu wrote:
>> Webrev: http://cr.openjdk.java.net/~zgu/JDK-8230483/webev.00/
> 
> D'uh. Looks good!
> 
> Maybe change the synopsis? E.g.:
>   "Shenandoah: consistently disable concurrent roots for Traversal mode"
> 

Changed and pushed.

-Zhengyu