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

[Stefan Karlsson]

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
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