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Remove std::pow from reduction. (#2234)
This is a functional simplification that removes the std::pow from reduction. The resulting reduction values are within 1% of master. This is a simplification because i believe an fp addition and multiplication is much faster than a call to std::pow() which is historically slow and performance varies widely on different architectures. STC LLR: 2.95 (-2.94,2.94) [-3.00,1.00] Total: 23471 W: 5245 L: 5127 D: 13099 http://tests.stockfishchess.org/tests/view/5d27ac1b0ebc5925cf0d476b LTC LLR: 2.95 (-2.94,2.94) [-3.00,1.00] Total: 51533 W: 8736 L: 8665 D: 34132 http://tests.stockfishchess.org/tests/view/5d27b74e0ebc5925cf0d493c Bench 3765158
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