Compute simplified HQ r/rr at runtime
Hyperbola Quintessence works out without the "... * 2" in r and rr. This then is cheap enough to compute at runtime, instead of looking it up, for a minor speedup.
Passed apple-silicon|armv8|loongarch64 STC:
https://tests.stockfishchess.org/tests/view/6a15f031818cacc1db0aca49
LLR: 2.94 (-2.94,2.94) <0.00,2.00>
Total: 410208 W: 104369 L: 103556 D: 202283
Ptnml(0-2): 758, 43951, 114883, 44744, 768
Verified attacks_bb<ROOK>() and attacks_bb<BISHOP>() assembly remains unchanged on x86 (gcc 16.1.1).
closes https://github.com/official-stockfish/Stockfish/pull/6870
No functional change