Add indisreplident to fields refreshed by RelationReloadIndexInfo()

RelationReloadIndexInfo() is a fast-path used for index reloads in the
relation cache, and it has always forgotten about updating
indisreplident, which is something that would happen after an index is
selected for a replica identity.  This can lead to incorrect cache
information provided when executing a command in a transaction context
that updates indisreplident.

None of the code paths currently on HEAD that need to check upon
pg_index.indisreplident fetch its value from the relation cache, always
relying on a fresh copy on the syscache.  Unfortunately, this may not be
the case of out-of-core code, that could see out-of-date value.

Author: Shruthi Gowda
Reviewed-by: Robert Haas, Dilip Kumar, Michael Paquier
Discussion: 
https://postgr.es/m/caasxf_pbcxax0ww-3geruyftz0xrcs3lrpuhq4-z3fak1do...@mail.gmail.com
Backpatch-through: 11

Branch
------
REL_12_STABLE

Details
-------
https://git.postgresql.org/pg/commitdiff/7d27493b74c5893fb50b82266d019964493318d9

Modified Files
--------------
src/backend/utils/cache/relcache.c | 1 +
1 file changed, 1 insertion(+)

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