pgsql: Support IndexElem in raw_expression_tree_walker().

Support IndexElem in raw_expression_tree_walker().

Needed for cases in which INSERT ... ON CONFLICT appears inside a
recursive CTE item. Per bug #14153 from Thomas Alton.

Patch by Peter Geoghegan, slightly adjusted by me

Report: <20160521232802.22598.13537@wrigleys.postgresql.org>

Branch
------
master

Details
-------
http://git.postgresql.org/pg/commitdiff/eae1ad9b64eaa201444ff99848f674be91af0ee6

Modified Files
--------------
src/backend/nodes/nodeFuncs.c | 9 +++++++++
1 file changed, 9 insertions(+)

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