Moved Chunk out of FixedAllocator class so I could improve efficiency for SmallObjAllocator::Deallocate.
Moved Chunk out of FixedAllocator class so I could improve efficiency for
SmallObjAllocator::Deallocate.


git-svn-id: e2e1a767b54e5f731ad8ac18fa5089ee37d5625a@272 7ec92016-0320-0410-acc4-a06ded1c099a

claudiordgz/Loki,claudiordgz/Loki,claudiordgz/Loki