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6f0640a5 - Optimize ReduceSum, ReduceMean, ReduceMin, ReduceMax (#10280)

Optimize ReduceSum, ReduceMean, ReduceMin, ReduceMax (#10280) * Optimize ReduceSum, ReduceMean, ReduceMin, ReduceMax * improve reducemax, reducemin * faster, smaller * replace std::vector by gsl::span for shapes * fix merging issues