[flang] [llvm] [mlir] [flang][OMPIRBuilder][MLIR][llvm] Backend support for atomic control options (PR #151579)

[Sergio Afonso via llvm-commits]

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

Thank you Anchu, LGTM. I only have small nits, but no need for another review by me before merging.

https://github.com/llvm/llvm-project/pull/151579