Summary:
There's no reason these should be exclusive: -m is used only on update for the
update message, and --verbatim doesn't affect the udpate message. It's also
useful to allow both of these, if say I want to update my test plan by editing
my git commit message and also provide a message for the update from the
command line.
Test Plan:
ran arc diff with --verbatim and -m and saw my message from -m was used, as
well as my updates in the commit message went through.
Reviewers: jungejason, epriestley, vrana
Reviewed By: epriestley
CC: aran, Koolvin
Differential Revision: https://secure.phabricator.com/D2426
b8b4082efd