largefile: adjust the dirstate post update within a `parentchange` context
This is doing an update, so this seems more appropriate. No other change have been made, but the next changeset will :-)
Differential Revision: https://phab.mercurial-scm.org/D11144
$ echo "[extensions]" >> $HGRCPATH
$ echo "mq=" >> $HGRCPATH
$ hg init
$ echo 'base' > base
$ hg ci -Ambase
adding base
$ hg qnew -mmqbase mqbase
$ hg qsave
$ hg qrestore 2
restoring status: hg patches saved state