builtin-commit: Refresh cache after adding files.
builtin-commit: Refresh cache after adding files.

We have promised our users that after running git-status or
git-commit the index will be refreshed for a long time since
these commands were introduced.  Do refresh the index before
writing it out to keep the promise.

Signed-off-by: Kristian Høgsberg <ca9b5b1e27d4fa7f4ba6848bdd08ca52cfd6330c@redhat.com>
Signed-off-by: Junio C Hamano <a6723cc3f76163bf7adb636a73ac3b0ceb3e6b9b@pobox.com>

destenson/git,destenson/git,destenson/git,destenson/git,destenson/git,destenson/git,destenson/git,destenson/git