[flang][OpenMP] Introduce `semantics::omp::LoopControl` (#190647) This structure will contain the symbol for the iteration variable, the lower and upper bounds, and the increment if present in the form of evaluate::Expr. A source construct (such as DO CONCURRENT) may have several iteration variables, each with its own bounds and increment, represented by a list of LoopControl structures. For loop-transformation constructs that produce additional loops the current code returns an empty list of LoopControls, but it may be extended in the future to represent the yet-nonexistent loops for more accurate semantic analysis. The code introduced in this PR is not executed yet, but will be used in an upcoming PR. Issue: https://github.com/llvm/llvm-project/issues/185287 --------- Co-authored-by: Michael Kruse <llvm-project@meinersbur.de>
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