TT replace speed optimization.  Replaces some algebra with logic.  Idea ...

...came from

https://github.com/mcostalba/Stockfish/pull/187

Interestingly changing
if ((!A && (B || C)) || (B && C))
to
if ((!A & (B | C)) | (B & C))
is also possible but maybe a tiny tiny bit slower.

gcc 4.9.1
build ARCH=x86-64-modern
i7 mobile Windows7-64

Results for 50 tests for each version:

            Base      Test      Diff
    Mean    511309    516602    -5293
    StDev   12016     12075     2359

p-value: 0.988

No functional change.

Can someone else please run fishbench?