Remove _hash_chgbufaccess().

Robert Haas <rhaas@postgresql.org>

Commit: 7819ba1ef6c5297b7e27878d2b3d30c5bcef8939
Author: Robert Haas <rhaas@postgresql.org>
Date: 2016-12-23T12:14:37Z
Releases: 10.0
Remove _hash_chgbufaccess().

This is basically for the same reasons I got rid of _hash_wrtbuf()
in commit 25216c98938495fd741bf585dcbef45b3a9ffd40: it's not
convenient to have a function which encapsulates MarkBufferDirty(),
especially as we move towards having hash indexes be WAL-logged.

Patch by me, reviewed (but not entirely endorsed) by Amit Kapila.

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