refs: wrap the packed refs cache in a level of indirection
As we know, we can solve any problem in this manner. In this case, the problem is to avoid freeing a packed refs cache while somebody is using it. So add a level of indirection as a prelude to reference-counting the packed refs cache. Signed-off-by: NMichael Haggerty <mhagger@alum.mit.edu> Signed-off-by: NJunio C Hamano <gitster@pobox.com>
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