Merge changes Ic3a68557,Ib1dbe41a,I0da09270,Ibdbd720d into nextgenv2

* changes:
  Deringing cleanup: remove DERING_REFINEMENT (always on now)
  Don't run the deringing filter on skipped blocks within a superblock
  Don't dering skipped superblocks
  On x86 use _mm_set_epi32 when _mm_cvtsi64_si128 isn't available