RFR: 8081682: AbstractWorkGang::_terminate is never used

[Stefan Karlsson]

Hi all,

Please review this patch to remove the AbstractWorkGang::_terminate 
variable. The work gangs are never deleted and therefore the code which 
sets _terminate is never executed.

http://cr.openjdk.java.net/~stefank/8081682/webrev.00/
https://bugs.openjdk.java.net/browse/JDK-8081682

Thanks,
StefanK