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Enable New Pass Manager for Clang.
authorGian-Carlo Pascutto <gcp@sjeng.org>
Tue, 9 Feb 2021 16:38:58 +0000 (17:38 +0100)
committerJoost VandeVondele <Joost.VandeVondele@gmail.com>
Wed, 10 Feb 2021 18:54:26 +0000 (19:54 +0100)
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

Thanks to David Major for making me aware of this part
of LLVM development.

closes https://github.com/official-stockfish/Stockfish/pull/3346

No functional change


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