In the case of a workload where we're forcibly evicting a large page,
but most of the page is discarded during reconciliation and the page
doesn't split into multiple chunks, we were quitting, leaving the page
in place.  Instead, instantiate the page and swap it into place to
replace the previous version. Reference #1317.
Merge pull request #1335 from wiredtiger/reconcile-split-in-memory

Fix when reconciliation of large page results in a single, small page.