Add infrastructure to save and restore GUC values.

Robert Haas <rhaas@postgresql.org>

Commit: f5d9698a8400972bd604069a3f15ca33e535ea6e
Author: Robert Haas <rhaas@postgresql.org>
Date: 2014-11-24T21:37:56Z
Releases: 9.5.0
Add infrastructure to save and restore GUC values.

This is further infrastructure for parallelism.

Amit Khandekar, Noah Misch, Robert Haas

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