md/4.3

md updates for 4.3

- An assortment of little fixes, several for minor races only likely
  to be hit during testing
- further cluster-md-raid1 development, not ready for real use yet.
- new RAID6 syndrome code for ARM NEON
- fix a race where a write can return before failure of one device
  is properly recorded in metadata, so an immediate crash might result
  in that write being lost.
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