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Atomic Control Options are used to specify architectural characteristics to help lowering of atomic operations. The options used are: `-f[no-]atomic-remote-memory`, `-f[no-]atomic-fine-grained-memory`, `-f[no-]atomic-ignore-denormal-mode`. Legacy option `-m[no-]unsafe-fp-atomics` is aliased to `-f[no-]ignore-denormal-mode`. More details can be found in https://github.com/llvm/llvm-project/pull/102569. This PR implements the frontend support for these options with OpenMP atomic in flang. Backend changes are available in the draft PR: https://github.com/llvm/llvm-project/pull/143769 which will be raised after this merged.