Commits on Jul 31, 2020

1. [NNUE] StateInfo handling speed improvement …

   Don't copy NNUE parts of StateInfo when not needed in do_null_move().
   Measurement vs master at STC shows only ~3 Elo regression when NNUE
   is not used, was ~5 Elo before.
   
   https://tests.stockfishchess.org/tests/view/5f23a9052f7e63962b99f51b
   ELO: -3.02 +-1.7 (95%) LOS: 0.0%
   Total: 60000 W: 11145 L: 11666 D: 37189
   Ptnml(0-2): 1018, 6945, 14494, 6626, 917
   
   No functional change.

   

   dorzechowski committed Jul 31, 2020
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