Kazu Hirata 0db88db5d9 flang] Remove remaining uses of llvm::Optional (NFC) ...

This patch removes the unused "using" declaration and removes #include
"llvm/ADT/Optional.h".

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

2023-01-07 22:32:38 -08:00

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