bench: allow 'raw' mode.
bench: allow 'raw' mode.

This mode populates a character table and iterates over the input,
attempting to check if the character matches any in the table. Compare
with actual JSON processing

Change-Id: I39313a70e5f715367b5658652e935e31fed0952a
Reviewed-on: http://review.couchbase.org/53260
Tested-by: buildbot <80754af91bfb6d1073585b046fe0a474ce868509@couchbase.com>
Reviewed-by: Dave Rigby <a09264da4832c7ff1d3bf1608a19f4b870f93750@couchbase.com>

mnunberg/subjson,mnunberg/subjson