Use pg_pread() and pg_pwrite() in slru.c.

This avoids lseek() system calls at every SLRU I/O, as was
done for relation files in commit c24dcd0c.

Reviewed-by: Ashwin Agrawal <[email protected]>
Reviewed-by: Andres Freund <[email protected]>
Discussion: 
https://postgr.es/m/CA%2BhUKG%2Biqke4uTRFj8D8uEUUgj%2BRokPSp%2BCWM6YYzaaamG9Wvg%40mail.gmail.com
Discussion: 
https://postgr.es/m/CA%2BhUKGJ%2BoHhnvqjn3%3DHro7xu-YDR8FPr0FL6LF35kHRX%3D_bUzg%40mail.gmail.com

Branch
------
master

Details
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https://git.postgresql.org/pg/commitdiff/e2b37d9e7cabc90633c4bd822e1bcfdd1bda44c4

Modified Files
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src/backend/access/transam/slru.c | 25 ++++---------------------
1 file changed, 4 insertions(+), 21 deletions(-)

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