read-cache: teach refresh_cache_entry to take istate
Refactor refresh_cache_entry() to work on a specific index, instead of implicitly using the_index. This is in preparation for making the make_cache_entry function apply to a specific index. Signed-off-by: NJameson Miller <jamill@microsoft.com> Signed-off-by: NJunio C Hamano <gitster@pobox.com>
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