(ITS#7339) back-mdb aborts with online index additions

Full_Name: Howard Chu Version: HEAD/RE24 OS: URL: ftp://ftp.openldap.org/incoming/ Submission from: (NULL) (37.19.97.21) Submitted by: hyc

Already fixed in d1a7fa267bdb9e27777ba87db44034ce83a75084

If new databases are added (such as when adding a new index via cn=config) they may cause additional pages to be dirtied during txn_commit. The pages would be pulled from the freelist. But the updates occurred after the freelist had already been written out, so the new state of the freelist wasn't being saved. Subsequent transactions would abort due to internal corruption.