: constant fold None

[ThomasJannaud]

Summary: Constant folding should fold 'None' and consider it a constant

Differential Revision: D74280168

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This pull request was exported from Phabricator. Differential Revision: D74280168

[JacobSzwejbka]

Sorry for the late review. Can you add some context on this? Does const_prop not trigger if one of the args is None? Can you add a unit test that wouldve failed before this change?

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[ThomasJannaud]

closed in favor of #10762