Revert "Nasty hack to claw back some perf"
Revert "Nasty hack to claw back some perf"

Breaks xboard and other actual game-playing interfaces which don't
follow this call pattern. Doesn't seem to help much with perf anyway.

This reverts commit 6735ab3ab443c2fad37ec9573b1435de01011049.

jwatzman/nameless-chessbot,jwatzman/nameless-chessbot