squased commits from internal repository

squased commits from internal repository

- doc: skylakesp2 results now with AVX512 intrinsics

- add AVX512 support for single precision intrinsics without
  gather/scatter

  The AVX512 intrinsics are divided into "pure" AVX512
  (load/store/compute) and AVX512-GATHER which include gather/scatter.

  This enables us to support at least AVX512 single precision intrinsics
  for all kernels which do not require gather/scatter support.

- fix test.sh: reenabled dp tests

- fix pull-split-nt: adjusted tmp array size to different vector
  lenghts