Kazu Hirata a38cfc50fc [llvm] Use std::nullopt instead of None (NFC) ...

I've verified that every change in this patch affects generated files
and would reduce the number of warnings if None were deprecated.

This is part of an effort to migrate from llvm::Optional to
std::optional:

https://discourse.llvm.org/t/deprecating-llvm-optional-x-hasvalue-getvalue-getvalueor/63716

2022-12-04 13:52:42 -08:00

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