RFR: 8026720: Remove the unused SpaceManager::mangle_freed_chunks

[Stefan Karlsson]

Hi all,

Please review this patch to remove the unused 
SpaceManager::mangle_freed_chunks.

http://cr.openjdk.java.net/~stefank/8026720/webrev.00
https://bugs.openjdk.java.net/browse/JDK-8026720

The original bug proposed that we should add Metachunk mangling. That 
part is already being fixed with:
http://mail.openjdk.java.net/pipermail/hotspot-dev/2016-March/022103.html

Thanks,
StefanK