pgsql: pg_upgrade: use CTE query rather than temp table

pg_upgrade: use CTE query rather than temp table

Now that 8.3 is not supported, we can use a CTE and not temp tables.
This allows for auto-oid assignment protection in a future patch.

Branch
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master

Details
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http://git.postgresql.org/pg/commitdiff/5d16332e96977d8166ea631891f6e2cf3ff11f45

Modified Files
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contrib/pg_upgrade/info.c | 130 +++++++++++++++++++++++----------------------
1 file changed, 67 insertions(+), 63 deletions(-)

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