Provide a DSA area for all parallel queries.

Robert Haas <rhaas@postgresql.org>

Commit: e13029a5ce353574516c64fd1ec9c50201e705fd
Author: Robert Haas <rhaas@postgresql.org>
Date: 2016-12-19T22:11:46Z
Releases: 10.0
Provide a DSA area for all parallel queries.

This will allow future parallel query code to dynamically allocate
storage shared by all participants.

Thomas Munro, with assorted changes by me.

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Documentation touched