RFR (7xS): 8162928: Micro-optimizations in scanning the remembered sets

[Kim Barrett]

> On May 5, 2017, at 7:39 AM, Thomas Schatzl <thomas.schatzl at oracle.com> wrote:
> 
>  thanks for your reviews.
> 
> For reference, the webrev I am going to push is as follows, as a change
> in the previous CR change the signature of
> oops_on_card_seq_iterate_careful:
> http://cr.openjdk.java.net/~tschatzl/8162928/webrev.0_to_1/ (diff)
> http://cr.openjdk.java.net/~tschatzl/8162928/webrev.1/ (full)
> 
> Thanks,
>   Thomas

Still looks good.