RFR: 8081007: Remove redundant active worker variables and calls in ParNewGeneration::collect

[Kim Barrett]

On May 25, 2015, at 9:29 AM, Stefan Karlsson <stefan.karlsson at oracle.com> wrote:
> 
> Hi all,
> 
> Please review this small patch to unify how the number of active workers are passed around in ParNewGeneration::collect.
> 
> http://cr.openjdk.java.net/~stefank/8081007/webrev.00/
> https://bugs.openjdk.java.net/browse/JDK-8081007
> 
> - Removed the unnecessary n_workers variable.
> - Replaced workers()->active_workers() with active_workers.
> - Removed workers NULL check assert, since the exact same assert is performed earlier in the function.
> 
> Thanks,
> StefanK

Nice cleanup.  Looks good.