RFR (S) 8215043: Remove declaration of parallel_worker_threads

[JC Beyler]

Hi all,

When working on JDK-8213224, there was an oversight of removing a
declaration from vm_version.hpp.

This fixes that oversight, could I get a review please:

Webrev: http://cr.openjdk.java.net/~jcbeyler/8215043/webrev.00/
Bug: https://bugs.openjdk.java.net/browse/JDK-8215043

Thanks,
Jc
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