RFR (M) JDK-8025305 Cleanup CardTableModRefBS usage in G1

[Thomas Schatzl]

Hi,

On Tue, 2013-09-24 at 15:57 +0200, Mikael Gerdin wrote:
> Hi all!
> 
> In preparation for fixing 8014555 (the bug discussed in the "G1 
> question: concurrent cleaning of dirty cards" thread) I'd like to clean 
> up the CardTableModRefBS-code slightly.
> 
> Summary of change:
>[...]

Looks good.

Thomas