Move CheckPointBuffers to PreCheckPointGuts to save FSM/VM pages on normal shutdown #613
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## Problem See https://neondb.slack.com/archives/C03QLRH7PPD/p1743746717119179 We wallow FSM/VM pages when they are written to disk to persist them in PS. But it is not happen during shutdown checkpoint, because writing to WAL during checkpoint cause Postgres panic. ## Summary of changes Move `CheckPointBuffers` call to `PreCheckPointGuts` Postgres PRs: neondatabase/postgres#615 neondatabase/postgres#614 neondatabase/postgres#613 neondatabase/postgres#612 --------- Co-authored-by: Konstantin Knizhnik <[email protected]>
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