RFR(XXS) 8222188: Shenandoah: Adjust Shenandoah work gang types

[Roman Kennke]

I'd be careful with this, and not change it unless we really have to.
Have you checked if we use any of is_ConcurrentGC_thread(),
is_Worker_thread(), is_GC_task_thread() anywhere? I believe the OOM
handler might use this to differenciate different types of threads.

Roman

> Am Dienstag, den 09.04.2019, 10:13 -0400 schrieb Zhengyu Gu:
> This is a cleanup in preparation for concurrent class unloading.
> 
> Bug: https://bugs.openjdk.java.net/browse/JDK-8222188
> Webrev: 
> http://cr.openjdk.java.net/~zgu/JDK-8222188/webrev.00/index.html
> 
> Test:
>    hotspot_gc_shenandoah on Linux 64 (fastdebug and release)
> 
> Thanks,
> 
> -Zhengyu
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