revision.c: allow handle_revision_arg() to take other flags
The existing "cant_be_filename" that tells the function that the
caller knows the arg is not a path (hence it does not have to be
checked for absense of the file whose name matches it) is made into
a bit in the flag word.
Signed-off-by: NJunio C Hamano <gitster@pobox.com>
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