Commits on Feb 9, 2021

1. Enable New Pass Manager for Clang. …

   Clang has a new optimization pass manager activated by
   -fexperimental-new-pass-manager. It's been in development
   for several years, and by now generally performing better
   than the default. It is planned to be the new default in
   Clang 13, but even versions before that perform better with it,
   and it's stable enough that major software like Firefox has
   been using it already:
   https://bugzilla.mozilla.org/show_bug.cgi?id=1619461
   
   It's about 1% speedup for Stockfish.
   
   Result of 100 runs
   ==================
   base (...fish_clang12) =    1946851  +/- 3717
   test (./stockfish    ) =    1967276  +/- 3408
   diff                   =     +20425  +/- 2438
   
   speedup        = +0.0105
   P(speedup > 0) =  1.0000
   
   CPU: 4 x Intel(R) Xeon(R) CPU E3-1240 v3 @ 3.40GHz
   Hyperthreading: on
   
   Thanks to David Major for making me aware of this part
   of LLVM development.

   

   gcp committed Feb 9, 2021
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