[flang-commits] [flang] [NFC][CodeGen] Change CodeGenOpt::Level/CodeGenFileType into enum classes (PR #66295)

[Andrzej Warzyński via flang-commits]

https://github.com/banach-space approved this pull request.

Flang driver changes LGTM, thanks!

https://github.com/llvm/llvm-project/pull/66295