Add AVX512 operations#13

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dong0321 wants to merge 13 commits intobosilca:masterfrom

dong0321:avx512_reduction

Commits on Oct 21, 2019

add AVX512 op
dong0321
committed

Commits on Oct 25, 2019

Commits on Nov 6, 2019

Small improvement to the AVX code, for small cases.
bosilca
committed

Commits on Nov 7, 2019

Commits on Nov 8, 2019

Commits on Nov 10, 2019

Correctness check for all types and all operations
dong0321
committed

Commits on Nov 15, 2019

Correctness check for all types and all operations with mm256 & duff device code
dong0321
committed

Commits on Dec 3, 2019