Fix ON CONFLICT DO UPDATE for tables with oids.

Andres Freund <andres@anarazel.de>

Commit: 90586ef127c593002897ee0bcafdf2adb6a18c7d
Author: Andres Freund <andres@anarazel.de>
Date: 2015-09-28T17:30:03Z
Releases: 9.5.0
Fix ON CONFLICT DO UPDATE for tables with oids.

When taking the UPDATE path in an INSERT .. ON CONFLICT .. UPDATE tables
with oids were not supported. The tuple generated by the update target
list was projected without space for an oid - a simple oversight.

Reported-By: Peter Geoghegan
Author: Andres Freund
Backpatch: 9.5, where ON CONFLICT was introduced

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