Optimize pg_visibility with read streams.

Noah Misch <noah@leadboat.com>

Commit: 65c310b310a613d86c1ba94891fa9972587e09fd
Author: Noah Misch <noah@leadboat.com>
Date: 2024-09-10T22:21:33Z
Releases: 18.0
Optimize pg_visibility with read streams.

We've measured 5% performance improvement, and this arranges to benefit
automatically from future optimizations to the read_stream subsystem.
The area lacked test coverage, so close that gap.

Nazir Bilal Yavuz

Discussion: https://postgr.es/m/CAN55FZ1_Ru3XpMgTwsU67FTH2fs_FrRROmb7x6zs+F44QBEiww@mail.gmail.com
Discussion: https://postgr.es/m/CAEudQAozv3wTY5TV2t29JcwPydbmKbiWQkZD42S2OgzdixPMDQ@mail.gmail.com

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