AVX2 vectorization of Poseidon S-box #244
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4%5% off hash times for width 8 and9%10% for width 12.The function need interleaved to observe an improvement. My original attempt computed x^7 for one vector before moving onto another vector; this resulted in dependency chains that were too long, and the loop had too many instructions for CPU reordering to work. The compiler did not interleave the instructions itself, so I had to do it manually.