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(parent: 7e61edf) | patch

Move pgstat.tmp into a temporary directory under $PGDATA named pg_stat_tmp.

Move pgstat.tmp into a temporary directory under $PGDATA named pg_stat_tmp.
This allows the use of a ramdrive (either through mount or symlink) for
the temporary file that's written every half second, which should
reduce I/O.

On server shutdown/startup, the file is written to the old location in
the global directory, to preserve data across restarts.

Bump catversion since the $PGDATA directory layout changed.

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