pgsql: Get rid of more cases of the "must detoast before output functio

Get rid of more cases of the "must detoast before output function" meme.

I missed that json.c was doing this too, because for some bizarre reason
it wasn't doing it adjacent to the output function call.

Branch
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master

Details
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http://git.postgresql.org/pg/commitdiff/e36ce0c7f7b329b25f92cf440fd88fcc695de101

Modified Files
--------------
src/backend/utils/adt/json.c | 60 +++++-------------------------------------
1 file changed, 7 insertions(+), 53 deletions(-)

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