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The `struct ref_store` variable exposes two ways to optimize a reftable backend: 1. pack_refs 2. optimize The former was specific to the 'files' + 'packed' refs backend. The latter is more generic and covers all backends. While the naming is different, both of these functions perform the same functionality. Consolidate this code to only maintain the 'optimize' functions. Do this by modifying the backends so that they exclusively implement the `optimize` callback, only. All users of the refs subsystem already use the 'optimize' function so there is no changes needed on the callee side. Finally, cleanup all references to the 'pack_refs' field of the structure and code around it. Signed-off-by: Karthik Nayak <karthik.188@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>