RFR (S) 8215043: Remove declaration of parallel_worker_threads

[Thomas Schatzl]

Hi,

On Fri, 2018-12-07 at 21:20 -0800, JC Beyler wrote:
> 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

  looks good.

Thomas