Simplify a couple of pg_dump and psql \d queries about index constraints
by joining to pg_constraint.conindid, instead of the former technique of joining indirectly through pg_depend. This is much more straightforward and probably faster as well. I had originally desisted from changing these queries when conindid was added because I was worried about losing performance, but if we join on conrelid as well as conindid then the index on conrelid can be used when pg_constraint is large.
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