Merge branch 'ds/bsearch-hash'

Code to find the length to uniquely abbreviate object names based on packfile content, which is a relatively recent addtion, has been optimized to use the same fan-out table. * ds/bsearch-hash: sha1_name: use bsearch_pack() in unique_in_pack() sha1_name: use bsearch_pack() for abbreviations packfile: define and use bsearch_pack() sha1_name: convert struct min_abbrev_data to object_id