[flang-commits] [flang] [NFC][flang][OpenMP] Split `DataSharing` and `Clause` processors (PR #81973)

[Kareem Ergawy via flang-commits]

ergawy wrote:

> This makes sense to me. I'd create a subdirectory `OpenMP` and move these files in there (and rename `OpenMPUtils` to just `Utils`). What about `ReductionProcessor`?

Thanks for taking a look @kparzysz. Moved to sub-dir and also split `ReductionProcessor`.

https://github.com/llvm/llvm-project/pull/81973