diff: split off a function for --stat-* option parsing
As an optimization, the diff_opt_parse() switchboard has a single case for all the --stat-* options. Split it off into a separate function so we can enhance it without bringing code dangerously close to the right margin. Signed-off-by: NJonathan Nieder <jrnieder@gmail.com> Signed-off-by: NMatthieu Moy <Matthieu.Moy@imag.fr> Signed-off-by: NJunio C Hamano <gitster@pobox.com>
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