Require non-NULL pstate for all addRangeTableEntryFor* functions.

Robert Haas <rhaas@postgresql.org>

Commit: bc93ac12c2544b6b3a68b6cb0282e0828fa14a34
Author: Robert Haas <rhaas@postgresql.org>
Date: 2015-03-11T19:26:43Z
Releases: 9.5.0
Require non-NULL pstate for all addRangeTableEntryFor* functions.

Per discussion, it's better to have a consistent coding rule here.

Michael Paquier, per a node from Greg Stark referencing an old post
from Tom Lane.

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