Add new user fn pg_current_xlog_flush_location()

Simon Riggs <simon@2ndQuadrant.com>

Commit: e63bb4549a2f47b86de9fc21c9f8b00440f34f99
Author: Simon Riggs <simon@2ndQuadrant.com>
Date: 2016-01-12T07:54:52Z
Releases: 9.6.0
Add new user fn pg_current_xlog_flush_location()

Tomas Vondra, reviewed by Michael Paquier and Amit Kapila
Minor edits by me

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