AlterTableCreateToastTable API still not right for pg_migrator

I just started reading the pg_migrator source code, and I notice that
we still didn't get AlterTableCreateToastTable's API right for
pg_migrator's usage.  It needs to be exposing an option to force
a particular OID for the toast table.  The way pg_migrator is handling
that now is both ugly and unsafe, and it's really pretty silly when the
underlying create_toast_table() function is perfectly capable of being
told what we want it to do.

There's still time to fix this before RC1.  I propose adding
"Oid toastOid" to AlterTableCreateToastTable's arguments, with
the semantics that if it's not InvalidOid then we attempt to create
the toast table with that OID.
        regards, tom lane