remove useless set of active snap - Mailing list pgsql-hackers

This patch removes a useless pushing of an active snapshot on
PortalStart.  Instead of push/get/pop of the active snapshot, without
any intervening use of the active snapshot, we just pass a local
snapshot down to CreateQueryDesc.

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Alvaro Herrera                                http://www.CommandPrompt.com/
The PostgreSQL Company - Command Prompt, Inc.