Improve distances_simd.cpp for aarch64#2392

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wx257osn2 wants to merge 2 commits intofacebookresearch:mainfrom wx257osn2:improve-distances_simd_cpp-for-aarch64

+70-6

Commits on Jul 24, 2022

use across vector arithmetic instead of hand-reduction
wx257osn2
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implement fvec_madd and fvec_madd_and_argmin using ARM SIMD (NEON)
wx257osn2
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