Request for review (m) - 8022725:Refactor code in concurrentMarkSweepGeneration.cpp

[Jon Masamitsu]

8022725:Refactor code in concurrentMarkSweepGeneration.cpp

concurrentMarkSweepGeneration.cpp is a rather large file and should be 
refactored (split into multiple
files) for easier maintenance.

There are no intended semantic changes. Only reorganization and moving 
of code.

I've been investigating some issues with compiler optimizations on this 
file and the refactoring will make that doable.

http://cr.openjdk.java.net/~jmasa/8022725/webrev.00/