Repair problems seen when CREATE OPERATOR mentions a

Repair problems seen when CREATE OPERATOR mentions a
not-yet-defined operator in commutator, negator, etc links.  This is
necessary in order to ensure that a pg_dump dump of user-defined operators
can be reloaded.  There may still be a bug lurking here, because it's
provoking a 'Buffer Leak' notice message in one case.  See my mail to
pgsql-hackers.