Pavel Begunkov 9cf7c104de io_uring: remove sequence from io_kiocb
req->sequence is used only for deferred (i.e. DRAIN) requests, but
initialised for every request. Remove req->sequence from io_kiocb
together with its initialisation in io_init_req().

Replace it with a new field in struct io_defer_entry, that will be
calculated only when needed in io_req_defer(), which is a slow path.

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
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