Use the sortsupport infrastructure in more cases.

Robert Haas <rhaas@postgresql.org>

Commit: 5ea86e6e65dd2da3e9a3464484985d48328e7fe3
Author: Robert Haas <rhaas@postgresql.org>
Date: 2014-11-07T20:50:55Z
Releases: 9.5.0
Use the sortsupport infrastructure in more cases.

This removes some fmgr overhead from cases such as btree index builds.

Peter Geoghegan, reviewed by Andreas Karlsson and me.

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