Fix zeroing of pg_serial page without SLRU bank lock

Bug in commit 53c2a97a9266: we failed to acquire the correct SLRU bank
lock when iterating to zero-out intermediate pages in predicate.c.
Rewrite the code block so that we follow the locking protocol correctly.

Also update an outdated comment in the same file -- SerialSLRULock
exists no more.

Reported-by: Alexander Lakhin <[email protected]>
Reviewed-by: Dilip Kumar <[email protected]>
Discussion: https://postgr.es/m/[email protected]

Branch
------
master

Details
-------
https://git.postgresql.org/pg/commitdiff/be2f0731006300876b008fd78a265471984cbcd9

Modified Files
--------------
src/backend/storage/lmgr/predicate.c | 19 ++++++++++++-------
1 file changed, 12 insertions(+), 7 deletions(-)

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