Remove Killer Heuristic In Move Ordering

Passed Non-regression STC:
LLR: 2.96 (-2.94,2.94) <-1.75,0.25>
Total: 80480 W: 20979 L: 20802 D: 38699
Ptnml(0-2): 279, 9610, 20337, 9683, 331
https://tests.stockfishchess.org/tests/view/669c12c14ff211be9d4ec69b

Passed Non-regression LTC:
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 77988 W: 19788 L: 19624 D: 38576
Ptnml(0-2): 66, 8605, 21481, 8783, 59
https://tests.stockfishchess.org/tests/view/669d628a4ff211be9d4ec7a8

closes https://github.com/official-stockfish/Stockfish/pull/5511

bench 1367740

src/movepick.cpp

@@ -86,15 +86,13 @@ MovePicker::MovePicker(const Position&              p,
                        const ButterflyHistory*      mh,
                        const CapturePieceToHistory* cph,
                        const PieceToHistory**       ch,
-                       const PawnHistory*           ph,
-                       Move                         km) :
+                       const PawnHistory*           ph) :
     pos(p),
     mainHistory(mh),
     captureHistory(cph),
     continuationHistory(ch),
     pawnHistory(ph),
     ttMove(ttm),
-    killer(km),
     depth(d) {
 
     if (pos.checkers())
@@ -164,8 +162,6 @@ void MovePicker::score() {
             m.value += (*continuationHistory[3])[pc][to];
             m.value += (*continuationHistory[5])[pc][to];
 
-            m.value += (m == killer) * 65536;
-
             // bonus for checks
             m.value += bool(pos.check_squares(pt) & to) * 16384;