[flang-commits] [flang] [Flang] Move non-Common headers to FortranSupport (PR #124416)

[Slava Zakharin via flang-commits]

https://github.com/vzakhari commented:

I concur with Jean on keeping utility headers "shared". Otherwise it looks good to me with minor remarks inlined.

https://github.com/llvm/llvm-project/pull/124416