Use PGAlignedXLogBlock for some code simplification

Peter Eisentraut <peter@eisentraut.org>

Commit: 804046b39a27973751c920f8f41504697f3f52d5
Author: Peter Eisentraut <peter@eisentraut.org>
Date: 2025-12-08T13:54:32Z
Use PGAlignedXLogBlock for some code simplification

The code in BootStrapXLOG() and in pg_test_fsync.c tried to align WAL
buffers in complicated ways.  Also, they still used XLOG_BLCKSZ for
the alignment, even though that should now be PG_IO_ALIGN_SIZE.  This
can now be simplified and made more consistent by using
PGAlignedXLogBlock, either directly in BootStrapXLOG() and using
alignas in pg_test_fsync.c.

Reviewed-by: Chao Li <li.evan.chao@gmail.com>
Reviewed-by: Thomas Munro <thomas.munro@gmail.com>
Discussion: https://www.postgresql.org/message-id/flat/f462a175-b608-44a1-b428-bdf351e914f4%40eisentraut.org

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