pack-objects: thin pack micro-optimization.
Since we sort objects by type, hash, preferredness and then
size, after we have a delta against preferred base, there is no
point trying a delta with non-preferred base. This seems to
save expensive calls to diff-delta and it also seems to save the
output space as well.
Signed-off-by: NJunio C Hamano <junkio@cox.net>
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