RFR (XXS): 8204617: ParallelGC parallel reference processing does not set MT degree in reference processor

[Kim Barrett]

> On Jun 8, 2018, at 10:52 AM, Thomas Schatzl <thomas.schatzl at oracle.com> wrote:
> 
> Hi all,
> 
>  can I have reviews for this small patch that properly sets the MT
> degree in the parallel gc full gc?
> 
> Otherwise some assert to be introduced in 8043575: Dynamically
> parallelize reference processing work will fire for any application
> using parallel gc that does not use the full amount of available gc
> threads (by UseDynamicNumberOfGCThreads).
> 
> CR:
> https://bugs.openjdk.java.net/browse/JDK-8204617
> Webrev:
> http://cr.openjdk.java.net/~tschatzl/8204617/webrev/
> Testing:
> hs-tier1-4,jdk-tier1-3 with +/-ParallelRefProcEnabled
> 
> Thanks,
>  Thomas

Looks good.