[flang] [llvm] [flang][OpenMP] Make OpenMP clause representation language-agnostic (PR #86289)

[Sergio Afonso via llvm-commits]

================
@@ -252,16 +319,35 @@ ReductionOperator makeReductionOperator(const parser::OmpReductionOperator &inp,
       inp.u);
 }
 
-// Actual clauses. Each T (where OmpClause::T exists) has its "make".
+// --------------------------------------------------------------------
+// Actual clauses. Each T (where tomp::T exists in ClauseT) has its "make".
+
+// Absent: missing-in-parser
+// AcqRel: empty
+// Acquire: empty
+// AdjustArgs: incomplate
----------------
skatrak wrote:

```suggestion
// AdjustArgs: incomplete
```

https://github.com/llvm/llvm-project/pull/86289