RFR (XS): 8053998: Hot card cache flush chunk size too coarse grained

[Marcus Larsson]

Hi,

Can I have reviews for this small patch changing the hot card cache 
flush chunks to a fixed size?

CR:
http://cr.openjdk.java.net/~mgerdin/mlarsson/webrev-8053998/

Bug:
https://bugs.openjdk.java.net/browse/JDK-8053998

Testing:
jprt, SPECjbb2013

Thanks,
Marcus