Add to_regprocedure() and to_regoperator().

Robert Haas <rhaas@postgresql.org>

Commit: dfc0219f649d5450a5e4d491dab1eeb23ac5530a
Author: Robert Haas <rhaas@postgresql.org>
Date: 2014-04-16T16:21:43Z
Releases: 9.4.0
Add to_regprocedure() and to_regoperator().

These are natural complements to the functions added by commit
0886fc6a5c75b294544263ea979b9cf6195407d9, but they weren't included
in the original patch for some reason.  Add them.

Patch by me, per a complaint by Tom Lane.  Review by Tatsuo
Ishii.

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