files_initial_transaction_commit(): use a transaction for packed refs
Use a `packed_ref_store` transaction in the implementation of `files_initial_transaction_commit()` rather than using internal features of the packed ref store. This further decouples `files_ref_store` from `packed_ref_store`. Signed-off-by: NMichael Haggerty <mhagger@alum.mit.edu> Signed-off-by: NJunio C Hamano <gitster@pobox.com>
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