[flang-commits] [flang] [flang][OpenMP][NFC] Outline `genOpWithBody` & `createBodyOfOp` args (PR #80817)

[Kareem Ergawy via flang-commits]

ergawy wrote:

Thanks for the approval @tblah!

Since this needs C++20, I opened [an RFC to upgrade to 20](https://discourse.llvm.org/t/rfc-upgrading-c-std-from-17-to-20-in-flang/76825). I will park this PR until we reach a conclusion.

https://github.com/llvm/llvm-project/pull/80817