Remove barrier.h

Robert Haas <rhaas@postgresql.org>

Commit: e343dfa42bff35983c582da3916b205763aeac90
Author: Robert Haas <rhaas@postgresql.org>
Date: 2016-11-23T01:28:24Z
Releases: 10.0
Remove barrier.h

A new thing also called a "barrier" is proposed, but whether we decide
to take that patch or not, this file seems to have outlived its
usefulness.

Thomas Munro

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