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