Restructure the pg_upgrade code to use several global structures rather

Bruce Momjian <bruce@momjian.us>

Commit: e13f7e9a711c9117e438516537066bbe61df6455
Author: Bruce Momjian <bruce@momjian.us>
Date: 2010-10-19T21:38:34Z
Releases: 9.1.0
Restructure the pg_upgrade code to use several global structures rather
than packing everything into 'ctx' and passing that to every function.

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