btrfs: backref: move btrfs_backref_(node|edge|cache) structures to backref.h
These 3 structures are the main part of btrfs backref cache, move them to backref.h to build the basis for later reuse. Signed-off-by: NQu Wenruo <wqu@suse.com> Reviewed-by: NDavid Sterba <dsterba@suse.com> Signed-off-by: NDavid Sterba <dsterba@suse.com>
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