maybe _mm_insert_epi64 is unavailable on i386?
#493
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Error message of h2o/h2o#3289 indicates that some i386 environments might have access to AVX2 but not to
_mm_insert_epi64because the latter takes a 64-bit int as an argument.This PR adds the invocation of
_mm_insert_epi64to the test code used for checking if fusion can be used, so that fusion would be disabled on environments that lack support for the intrinsic.