target: Shrink struct se_cmd by rearranging fields
On x86-64, these changes reduce the struct size from 528 bytes to 496 bytes. We save a cacheline and get under 512 bytes for better packing. Signed-off-by: NRoland Dreier <roland@purestorage.com> Acked-by: NSagi Grimberg <sagig@mellanox.com> Reviewed-by: NChristoph Hellwig <hch@lst.de> Signed-off-by: NNicholas Bellinger <nab@linux-iscsi.org>
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