Prefetch continuation correction histories
Prefetch the two continuation-correction history entries read by the child before updating the position, hiding part of their latency. The prefetched addresses exactly match the later reads for normal moves; castling and promotions may issue a harmless approximate prefetch.
Passed STC:
https://tests.stockfishchess.org/tests/view/6a6c4b56c054e285ae0298ee
LLR: 3.35 (-2.94,2.94) <0.00,2.00>
Total: 480448 W: 124828 L: 123878 D: 231742
Ptnml(0-2): 1147, 51094, 134829, 51970, 1184
Architecture spot checks were positive on Graviton 3 (about 1.0% lower elapsed time) and Zen 3 AVX2 (about 0.5% lower), and neutral on Ice Lake AVX-512 (about +0.03% elapsed time). A fresh Graviton 3 bench after rebasing on current master reproduced about 1.0% lower elapsed time with identical nodes.
closes https://github.com/official-stockfish/Stockfish/pull/7025
No functional change