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Fix O(N^2) behavior in pg_dump for large numbers of owned sequences.
The loop that matched owned sequences to their owning tables required time proportional to number of owned sequences times number of tables; although this work was only expended in selective-dump situations, which is probably why the issue wasn't recognized long since. Refactor slightly so that we can perform this work after the index array for findTableByOid has been set up, reducing the time to O(M log N). Per gripe from Mike Roest. Since this is a longstanding performance bug, backpatch to all supported versions.
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