Kazu Hirata 192d9dd731 [mlir] Use std::nullopt instead of None in comments (NFC) ...

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 19:58:32 -08:00

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