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Commits 7bb3102c and 3eb77eba removed the only user of the EXTENSION_DONT_CHECK_SIZE flag, which had previously been required to checkpoint truncated relations. Since 7bb3102c, segments have been opened directly for synchronization without calling _mdfd_getseg(), so it doesn't need a mode that tolerates non-final short segments. Remove the redundant flag and associated comments. Reported-by: Andres Freund <andres@anarazel.de> Discussion: https://postgr.es/m/nyj4k7yur5t27rtygvx2i2lrlp6rqfvvhoiiwx4fznynksf2et%404hj2sp42alpe