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(parent: 5320c6c) | patch

Create a syscache for pg_database-indexed-by-oid, and make use of it

Create a syscache for pg_database-indexed-by-oid, and make use of it
in various places that were previously doing ad hoc pg_database searches.
This may speed up database-related privilege checks a little bit, but
the main motivation is to eliminate the performance reason for having
ReverifyMyDatabase do such a lot of stuff (viz, avoiding repeat scans
of pg_database during backend startup). The locking reason for having
that routine is about to go away, and it'd be good to have the option
to break it up.

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