[Flang][OpenMP] Fix missing dereference in isConstructWithTopLevelTarget

This was causing false negatives, yielding incorrect programs.

Author: agozillon

flang/lib/Lower/OpenMP/DataSharingProcessor.cpp

@@ -47,7 +47,7 @@ bool DataSharingProcessor::OMPConstructSymbolVisitor::isSymbolDefineBy(
 static bool isConstructWithTopLevelTarget(lower::pft::Evaluation &eval) {
   const auto *ompEval = eval.getIf<parser::OpenMPConstruct>();
   if (ompEval) {
-    auto dir = parser::omp::GetOmpDirectiveName(ompEval).v;
+    auto dir = parser::omp::GetOmpDirectiveName(*ompEval).v;
     if (llvm::omp::topTargetSet.test(dir))
       return true;
   }