RFR (S): 8155232: Augment Workgang to run task with a given number of threads

[Thomas Schatzl]

Hi Stefan,

On Thu, 2016-04-28 at 13:58 +0200, Stefan Karlsson wrote:
> Hi Thomas,
> 
> This change looks fine.
> 
> I have a slight reservation about using the word "thread" in this 
> context, since the tasks might be executed on a lower number of
> threads. 
> The surrounding code uses the word "workers" instead of "threads".
> Maybe 
> your function code be named run_task_on_workers, or maybe even use
> an 
> overloaded run_task function?

  made an overloaded run_task(). Sorry.

Webrev:
http://cr.openjdk.java.net/~tschatzl/8155232/webrev.1/

Also fixed up all dependent changesets in place due to the triviality
of this name change.

Thanks,
  Thomas