RFR (XXL): 8213108: Improve work distribution during remembered set scan

[Kim Barrett]

> On Jun 25, 2019, at 3:57 AM, Thomas Schatzl <thomas.schatzl at oracle.com> wrote:
> 
> http://cr.openjdk.java.net/~tschatzl/8213108/webrev.2_to_3/ (diff)
> http://cr.openjdk.java.net/~tschatzl/8213108/webrev.3/ (full)
> 
> Thanks,
>  Thomas

Still looks good.