[flang-commits] [flang] [flang] Use `createOpWithBody` for section op, NFC (PR #74659)

[Kiran Chandramohan via flang-commits]

https://github.com/kiranchandramohan approved this pull request.

Thanks @kparzysz for these cleanups.

https://github.com/llvm/llvm-project/pull/74659