Teach datum_image_eq() about cstring datums.

Bring datum_image_eq() in line with datumIsEqual() by adding support for
comparing cstring datums.

An upcoming patch that adds deduplication to the nbtree AM will use
datum_image_eq().  datum_image_eq() will need to work with all datatypes
that can be used as the storage type of a B-Tree index column, including
cstring.  (cstring is used as the storage type for columns of type
"name" as a space-saving optimization.)

Discussion: 
https://postgr.es/m/cah2-wzn3ee49gmxb7v1vj3-ac8fwn-fr8pfwqebhe8ryrxt...@mail.gmail.com

Branch
------
master

Details
-------
https://git.postgresql.org/pg/commitdiff/8c951687f58ad604be13e6addfd56446afb36e13

Modified Files
--------------
src/backend/utils/adt/datum.c | 19 ++++++++++++++++---
1 file changed, 16 insertions(+), 3 deletions(-)

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