Issue 61609
Summary [flang] Copy-pasted code. Seems one of them is wrong. May be the second should be x.upper(), y.upper()?
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Reporter ustchcs-bugfinder
    https://github.com/llvm/llvm-project/blob/08d094a0e457360ad8b94b017d2dc277e697ca76/flang/lib/Lower/IterationSpace.cpp#L451

Current code:
```
static bool isEqual(const Fortran::evaluate::Substring &x,
                      const Fortran::evaluate::Substring &y) {
 return std::visit(
               [&](const auto &p, const auto &q) { return isEqual(p, q); },
               x.parent(), y.parent()) &&
 isEqual(x.lower(), y.lower()) && isEqual(x.lower(), y.lower()); // ----> Same condition. May be the second should be x.upper()?
  }
```
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