RFR: 8080840: Clean up active_workers() asserts

[Jon Masamitsu]

Changes look good.

Reviewed.

Jon

On 05/21/2015 06:27 AM, Stefan Karlsson wrote:
> Hi all,
>
> Please, review this patch to clean up code checking and asserting that 
> the FlexibleWorkGang and active_workers() have been setup correctly.
>
> http://cr.openjdk.java.net/~stefank/8080840
> https://bugs.openjdk.java.net/browse/JDK-8080840
>
> This patch depends on the patch in:
> http://mail.openjdk.java.net/pipermail/hotspot-gc-dev/2015-May/013511.html 
>
>
> Thanks,
> StefanK