gc: --prune prunes unreferenced objects.
gc: --prune prunes unreferenced objects.

Brandon Casey correctly points out that we repack with -A without --prune
and with -a with --prune, so it is not just unreferenced loose objects
that are pruned away when the option is given.

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