RFR: 8234531: Remove CMS code from CLDG and safepoint cleanup

[erik.osterlund at oracle.com]

Hi,

There is some CMS code left in CLDG and safepoint cleanup. It should be 
removed.

Bug:
https://bugs.openjdk.java.net/browse/JDK-8234531

Webrev:
http://cr.openjdk.java.net/~eosterlund/8234531/webrev.00/

Thanks,
/Erik