[clang] [flang] [flang][driver] Add pre-processing type for Fortran pre-processed files (PR #104664)

[Kareem Ergawy via cfe-commits]

ergawy wrote:

Thanks a lot for the reply and apologies for being late, it is my turn to be OoO :).

Your reply definitely clarified a few things for me. I updated the PR title and added as a note as requested. Let me know if further details need to be added.



https://github.com/llvm/llvm-project/pull/104664