RFR(T) 8222419: Shenandoah: Remove unused _par_state_string in ShenandoahRootProcessor

[Roman Kennke]

Ok, looks good!

Thanks, Roman

> 
> Bug: https://bugs.openjdk.java.net/browse/JDK-8222419
> Webrev: http://cr.openjdk.java.net/~zgu/JDK-8222419/webrev.00/
> 
> 
> Test:
>    hotspot_gc_shenandoah
> 
> Thanks,
> 
> -Zhengyu
> 
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