prune: clean .git/shallow after pruning objects
This patch teaches "prune" to remove shallow roots that are no longer reachable from any refs (e.g. when the relevant refs are removed). Signed-off-by: NNguyễn Thái Ngọc Duy <pclouds@gmail.com> Signed-off-by: NJunio C Hamano <gitster@pobox.com>
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