I don't see any reason the checkpointing field needs to be declared
volatile.
Fix a comment, we no longer have "split" pages in the tree.
Minor code shuffle, don't free the multiblock structure while our caller
might reasonably still be using it.
Merge pull request #915 from wiredtiger/checkpointing_not_volatile

Remove volatile declaration from checkpointing field.
Merge branch 'develop' into new-split
Merge branch 'new-split' into new-split-overflow
Merge branch 'new-split-overflow' into new-split-ckpt-1