[clang] [flang][driver] Mark -fcommon and -mtune as visible in Flang (PR #68657)

[Andrzej Warzyński via cfe-commits]

https://github.com/banach-space requested changes to this pull request.

Thanks for working on. I would appreciate if you could add a bit more testing.

https://github.com/llvm/llvm-project/pull/68657