RFR(XS): Corrected the number of task queues for resetting and printing task queue stats

[Zhengyu Gu]

Hi,

A small fix to correct the number of the task queues when resetting and printing task queue stats.
Now, the number of task queues is no longer correlated to the number of concurrent threads.

Webrev: http://cr.openjdk.java.net/~zgu/shenandoah/nqueues/webrev.00/


Thanks,

-Zhengyu