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(parent: 8c19d14) | patch

Fix inheritance count tracking in ALTER TABLE .. ADD CONSTRAINT.

Fix inheritance count tracking in ALTER TABLE .. ADD CONSTRAINT.

Without this patch, constraints inherited by children of a parent
table which itself has multiple inheritance parents can end up with
the wrong coninhcount. After dropping the constraint, the children
end up with a leftover copy of the constraint that is not dumped
and cannot be dropped. There is a similar problem with ALTER TABLE
.. ADD COLUMN, but that looks significantly more difficult to
resolve, so I'm committing this fix separately.

Back-patch to 8.4, which is the first release that has coninhcount.

Report by Hank Enting.

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