Use more consistently int64 for page numbers in SLRU-related code

Michael Paquier <michael@paquier.xyz>

Commit: 3937cadfd4383fd32f3fd8d8dc5efc32b3d12664
Author: Michael Paquier <michael@paquier.xyz>
Date: 2024-07-23T08:59:05Z
Releases: 18.0
Use more consistently int64 for page numbers in SLRU-related code

clog.c, async.c and predicate.c included some SLRU page numbers still
handled as 4-byte integers, while int64 should be used for this purpose.

These holes have been introduced in 4ed8f0913bfd, that has introduced
the use of 8-byte integers for SLRU page numbers, still forgot about the
code paths updated by this commit.

Reported-by: Noah Misch
Author: Aleksander Alekseev, Michael Paquier
Discussion: https://postgr.es/m/20240626002747.dc.nmisch@google.com
Backpatch-through: 17

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