x86: Optimize strspn in strspn-c.c
Use _mm_cmpeq_epi8 and _mm_movemask_epi8 to get strlen instead of _mm_cmpistri. Also change offset to unsigned to avoid unnecessary sign extensions. geometric_mean(N=20) of all benchmarks that dont fallback on sse2; New / Original: .901 All string/memory tests pass. Reviewed-by:H.J. Lu <hjl.tools@gmail.com> (cherry picked from commit 412d1034)
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