Use dlists instead of SHM_QUEUE for syncrep queue

Andres Freund <andres@anarazel.de>

Commit: 12605414a7d63ccbe36de2b530847bdfc9cf7447
Author: Andres Freund <andres@anarazel.de>
Date: 2023-01-18T20:15:05Z
Releases: 16.0
Use dlists instead of SHM_QUEUE for syncrep queue

Part of a series to remove SHM_QUEUE. ilist.h style lists are more widely used
and have an easier to use interface.

Reviewed-by: Thomas Munro <thomas.munro@gmail.com> (in an older version)
Discussion: https://postgr.es/m/20221120055930.t6kl3tyivzhlrzu2@awork3.anarazel.de
Discussion: https://postgr.es/m/20200211042229.msv23badgqljrdg2@alap3.anarazel.de

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