pg_upgrade: prevent oid conflicts with new-cluster TOAST tables

Bruce Momjian <bruce@momjian.us>

Commit: 4c6780fd17aa43ed6362aa682499cc2f9712cc8b
Author: Bruce Momjian <bruce@momjian.us>
Date: 2014-08-07T18:56:13Z
Releases: 9.5.0
pg_upgrade: prevent oid conflicts with new-cluster TOAST tables

Previously, TOAST tables only required in the new cluster could cause
oid conflicts if they were auto-numbered and a later conflicting oid had
to be assigned.

Backpatch through 9.3

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