Make sure dircache resolves outstanding references on volume root.

If a volume root was open at the beginning of a build, its dircache
reference wouldn't be resolved on an already open volume root
directory because the call to do it was simply omitted. Nothing
horribly bad unless a root were opened at mount time and kept open
long term.

Change-Id: I09de30ff8174ad1d14eeeb9539bd23fb51b9e31a
1 file changed