ref_store: implement `refs_peel_ref()` generically
We're about to stop storing packed refs in a `ref_cache`. That means that the only way we have left to optimize `peel_ref()` is by checking whether the reference being peeled is the one currently being iterated over (in `current_ref_iter`), and if so, using `ref_iterator_peel()`. But this can be done generically; it doesn't have to be implemented per-backend. So implement `refs_peel_ref()` in `refs.c` and remove the `peel_ref()` method from the refs API. This removes the last callers of a couple of functions, so delete them. More cleanup to come... Signed-off-by: NMichael Haggerty <mhagger@alum.mit.edu> Signed-off-by: NJunio C Hamano <gitster@pobox.com>
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