Move some code from shmem.c and shmem.h

Heikki Linnakangas <heikki.linnakangas@iki.fi>

Commit: 6ef9bee29310fa519b1b0f01221fcf1c41a33679
Author: Heikki Linnakangas <heikki.linnakangas@iki.fi>
Date: 2026-04-05T23:12:48Z
Move some code from shmem.c and shmem.h

A little refactoring in preparation for the next commit, to make the
material changes in that commit more clear.

Reviewed-by: Ashutosh Bapat <ashutosh.bapat.oss@gmail.com>
Reviewed-by: Matthias van de Meent <boekewurm+postgres@gmail.com>
Discussion: https://www.postgresql.org/message-id/CAExHW5vM1bneLYfg0wGeAa=52UiJ3z4vKd3AJ72X8Fw6k3KKrg@mail.gmail.com

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