dirstate: make it mandatory to provide parentfiledata in set_clean
Gathering the mode, size and mtime, independently from determining that the file
is clean is a race-machine. So we just make these information required arguments.
(note that the data is still gathered in a racy way in practice, but at least
the API is no longer encouraging it.)
Differential Revision: https://phab.mercurial-scm.org/D11789