Problematic backport to 8u: "Ensure tasks use correct number of workers"

[Aleksey Shipilev]

On 10/02/2017 08:04 PM, Zhengyu Gu wrote:
> Updated: http://cr.openjdk.java.net/~zgu/shenandoah/assert_workers_8u/webrev.01/
> 
> So, you are going to push this with others, right?

Yes, I am going to re-do the bulk RFR for 8u backports later. This is technically the backport, and
should go to review with other backports.

Thanks,
-Aleksey