RFR (7u): 8046070 - Class Data Sharing clean up and refactoring

[Ioi Lam]

Bug: https://bugs.openjdk.java.net/browse/JDK-8046070
jdk9 review thread: 
http://mail.openjdk.java.net/pipermail/hotspot-runtime-dev/2014-August/012235.html
jdk9 webrev: http://cr.openjdk.java.net/~iklam/8046070-cds-cleanup-vfinal/
jdk8u-40 webrev: 
http://cr.openjdk.java.net/~iklam/8046070-cds-cleanup-backport-8u40/


The JDK 9 changes in the open source code applied mostly cleanly with 
some minor manual reshuffling of the
source code but otherwise no semantic differences.

Thanks
Ioi