[issue37794] Replace /Ox with /O2

[Steve Dower]

Steve Dower <steve.dower at python.org> added the comment:

Given the potential compatibility impact (small chance of third-party extensions relying on function aliasing), I'd like to see an update to Docs/whatsnew/3.9.rst as well.

Also the suggested change to the NEWS entry is good. I don't think this one should pass completely silently.

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nosy: +steve.dower
versions: +Python 3.9

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