bench: 3653942
* Use a bit less code to calculate hashfull(). Change post increment to preincrement as is more standard in the rest of stockfish. Scale result so we report 100% instead of 99.9% when completely full. No functional change.
* This is the Windows version of https://github.com/official-stockfish/Stockfish/pull/1829 No functional change.
Official release version of Stockfish 9 Bench 5023629
