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Add a helper to walk op list in reverse. Xe will make use of this when unwinding GPUVA operations. v2: (Rodrigo) reword commit message Reviewed-by: Rodrigo Vivi <rodrigo.vivi@intel.com> Signed-off-by: Matthew Brost <matthew.brost@intel.com> Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>