Set procost to 10 for each of the pg_foo_is_visible() functions.
The idea here is to make sure the planner will evaluate these functions last not first among the filter conditions in psql pattern search and tab-completion queries. We've discussed this several times, and there was consensus to do it back in August, but we didn't want to do it just before a release. Now seems like a safer time. No catversion bump, since this catalog change doesn't create a backend incompatibility nor any regression test result changes.
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