Avoid aggregating worker instrumentation multiple times.

Robert Haas <rhaas@postgresql.org>

Commit: 166b61a88ef8e9fb97eba7b7ab8062e214c93af8
Author: Robert Haas <rhaas@postgresql.org>
Date: 2015-11-18T17:35:25Z
Releases: 9.6.0
Avoid aggregating worker instrumentation multiple times.

Amit Kapila, per design ideas from me.

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