RFR (S): 8245030: CardTable::precleaned_card is unused

[Kim Barrett]

> On Jul 15, 2020, at 1:46 PM, Albert Yang <albert.m.yang at oracle.com> wrote:
> 
> Hi,
> 
> https://bugs.openjdk.java.net/browse/JDK-8245030
> 
> http://cr.openjdk.java.net/~lkorinth/albert/8245030/0/
> 
> Tested: hotspot_gc
> 
> /Albert

Looks good.