Fix avx512vbmi swizzle_dyn implementation #431
Merged
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With target_features = "avx512vbmi", swizzle_dyn with N = 32 did not set output lanes to 0 when the input index was out of range, because it used
_mm256_permutexvar_epi8
(vpermb) which, unlike_mm256_shuffle_epi8
(vpshufb), does not provide that behaviour.This PR fixes the problem and adds the avx512vbmi implementation for N = 64.