RFR(XS): 8141434: G1CollectedHeap::into_cset_dirty_card_queue_set should be moved to G1RemSet

[David Lindholm]

Hi,

Please review this cleanup patch that moves 
G1CollectedHeap::into_cset_dirty_card_queue_set to G1RemSet where it is 
used.

Bug: https://bugs.openjdk.java.net/browse/JDK-8141434
Webrev: http://cr.openjdk.java.net/~david/JDK-8141434/webrev.00/

Testing: Passed JPRT


Thanks,
David