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High performance character occurrence counter

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Faster implementation of std::count using AVX2

Times per 10 iterations, tested on i9-13900H Using GCC 13

Method 1Bil 500M 250M 10M 2M
Standard 1358ms 684ms 342ms 13606µs 2601µs
Optimized 376ms 179ms 94ms 1901µs 292µs
Multi Opt 229ms 111ms 55ms 6963µs 5980µs

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