[issue42366] Use MSVC2019 and /Ob3 option to compile Windows builds

[Christian Heimes]

Christian Heimes <lists at cheimes.de> added the comment:

Could you please try again with PGO? All our official builds use PGO.

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nosy: +christian.heimes

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue42366>
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