fix race condition between DROP TABLESPACE and checkpointing

When Who What
2022-03-16 09:38:15 Thomas Munro (macdice) Closed in commitfest 2022-03 with status: Committed
2022-03-16 09:38:15 Thomas Munro (macdice) Changed committer to macdice
2022-02-16 21:46:18 Nathan Bossart (bossartn) Changed authors to Nathan Bossart (bossartn)
2022-02-16 21:46:18 Nathan Bossart (bossartn) Changed targetversion to stable
2022-02-16 21:46:08 Nathan Bossart (bossartn) Attached mail thread 20220215235845.GA2665318@nathanxps13
2022-02-16 21:46:08 Nathan Bossart (bossartn) Created patch record