This is a non-functional simplification which removes the passedCount variable in pawns.
STC
LLR: 2.95 (-2.94,2.94) [-3.00,1.00]
Total: 27982 W: 6227 L: 6118 D: 15637
http://tests.stockfishchess.org/tests/view/
5cb3cdd30ebc5925cf017025
Combo STC
LLR: 2.95 (-2.94,2.94) [-3.00,1.00]
Total: 17368 W: 3925 L: 3795 D: 9648
http://tests.stockfishchess.org/tests/view/
5cb3d3510ebc5925cf01709a
Non functional test.