RFR (S): JDK-8076241: Remove unused methods mod_card_iterate() and non_clean_card_iterate_serial()

[Bengt Rutisson]

Hi all,

Could I have a couple of reviews for this small change?

http://cr.openjdk.java.net/~brutisso/8076241/webrev.00/
https://bugs.openjdk.java.net/browse/JDK-8076241

The methods mod_card_iterate() and non_clean_card_iterate_serial() in 
CardTableModRefBS are not being used.

Thanks,
Bengt