fuse classify and bitset building in decoder (-9.62%)#1
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classifytook ~20% ofdecode()time, with most of that spent inVec::pushwriting classified vectors to the heap one at a time. A bit suprising since classification is a set of cheap NEON table lookups, but I guess the per-element push overhead added upThis PR processes 64 byte chunks directly, classifying 4 16 byte subchunks and immediately building all 3 bitsets from the results