Avoid superfluous buffer locking during nbtree backwards scans

When Who What
2024-08-11 19:44:36 Peter Geoghegan (pgeoghegan) Closed in commitfest 2024-09 with status: Committed
2024-08-11 19:44:36 Peter Geoghegan (pgeoghegan) Changed committer to pgeoghegan
2024-08-06 23:41:29 Matthias van de Meent (mmeent) Added mmeent as reviewer
2024-07-05 16:50:42 Peter Geoghegan (pgeoghegan) Changed authors to Peter Geoghegan (pgeoghegan)
2024-07-05 16:50:34 Peter Geoghegan (pgeoghegan) Attached mail thread CAH2-Wz=xgs7PojG=EUvhgadwENzu_mY_riNh-w9wFPsaS717ew@mail.gmail.com
2024-07-05 16:50:34 Peter Geoghegan (pgeoghegan) Created patch record