[flang][OpenMP] Clarify confusing error message (#144707) The message "The atomic variable x should occur exactly once among the arguments of the top-level [...] operator" was intended to convey that (1) an atomic variable should be an argument, and (2) it should be exactly one of the arguments. However, the wording turned out to be sowing confusion instead. Rework the corresponding check, and emit an individual error message for each problematic situation: - "atomic variable cannot be a proper subexpression of an argument", - "atomic variable should appear as an argument", - "atomic variable should be exactly one of the arguments". Fixes https://github.com/llvm/llvm-project/issues/144599
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