MFC r255356:

Revert parts of r245132 and r245175. We don't need to write to the
IMAN register to clear the pending interrupt status bits. This patch
tries to solve problems seen on the MacBook Air, as reported by
Johannes Lundberg <johannes@brilliantservice.co.jp>
MFC r255483:

Do not emit size for non-regular files.  There is nothing that
mtree(1) can do in this situation and would cause confusion.
Merge remote-tracking branch 'upstream-github/stable/9' into stable/9