⚡ Use Bmi1.X64.TrailingZeroCount and Popcnt.X64.PopCount hardware intrinsics

[eduherminio]

Use Bmi1.X64.TrailingZeroCount and Popcnt.X64.PopCount hardware intrinsics when available

Result: disappointment after 20k games

Score of Lynx 1177 - hw intrinsics vs Lynx 1176 - main: 7983 - 7884 - 4503  [0.502] 20370
...      Lynx 1177 - hw intrinsics playing White: 4760 - 3168 - 2257  [0.578] 10185
...      Lynx 1177 - hw intrinsics playing Black: 3223 - 4716 - 2246  [0.427] 10185
...      White vs Black: 9476 - 6391 - 4503  [0.576] 20370
Elo difference: 1.7 +/- 4.2, LOS: 78.4 %, DrawRatio: 22.1 %
SPRT: llr -0.879 (-29.9%), lbound -2.94, ubound 2.94