[flang][OpenMP] Use GetOmpDirectiveName to find directive source location (#150955)

Author: kparzysz

flang/lib/Lower/OpenMP/DataSharingProcessor.cpp

@@ -389,42 +389,16 @@ void DataSharingProcessor::insertLastPrivateCompare(mlir::Operation *op) {
   }
 }
 
-static const parser::CharBlock *
-getSource(const semantics::SemanticsContext &semaCtx,
-          const lower::pft::Evaluation &eval) {
-  const parser::CharBlock *source = nullptr;
-
-  auto ompConsVisit = [&](const parser::OpenMPConstruct &x) {
-    std::visit(
-        common::visitors{
-            [&](const parser::OpenMPSectionsConstruct &x) {
-              source = &std::get<0>(x.t).source;
-            },
-            [&](const parser::OpenMPLoopConstruct &x) {
-              source = &std::get<0>(x.t).source;
-            },
-            [&](const parser::OpenMPBlockConstruct &x) {
-              source = &std::get<0>(x.t).source;
-            },
-            [&](const parser::OpenMPCriticalConstruct &x) {
-              source = &std::get<0>(x.t).source;
-            },
-            [&](const parser::OpenMPAtomicConstruct &x) {
-              source = &std::get<parser::OmpDirectiveSpecification>(x.t).source;
-            },
-            [&](const auto &x) { source = &x.source; },
-        },
-        x.u);
-  };
-
-  eval.visit(common::visitors{
-      [&](const parser::OpenMPConstruct &x) { ompConsVisit(x); },
-      [&](const parser::OpenMPDeclarativeConstruct &x) { source = &x.source; },
-      [&](const parser::OmpEndLoopDirective &x) { source = &x.source; },
-      [&](const auto &x) {},
+static parser::CharBlock getSource(const semantics::SemanticsContext &semaCtx,
+                                   const lower::pft::Evaluation &eval) {
+  return eval.visit(common::visitors{
+      [&](const parser::OpenMPConstruct &x) {
+        return parser::omp::GetOmpDirectiveName(x).source;
+      },
+      [&](const parser::OpenMPDeclarativeConstruct &x) { return x.source; },
+      [&](const parser::OmpEndLoopDirective &x) { return x.source; },
+      [&](const auto &x) { return parser::CharBlock{}; },
   });
-
-  return source;
 }
 
 static void collectPrivatizingConstructs(
@@ -518,11 +492,11 @@ void DataSharingProcessor::collectSymbols(
         for (const semantics::Scope &child : scope->children())
           collectScopes(&child);
       };
-  const parser::CharBlock *source =
-      clauses.empty() ? getSource(semaCtx, eval) : &clauses.front().source;
+  parser::CharBlock source =
+      clauses.empty() ? getSource(semaCtx, eval) : clauses.front().source;
   const semantics::Scope *curScope = nullptr;
-  if (source && !source->empty()) {
-    curScope = &semaCtx.FindScope(*source);
+  if (!source.empty()) {
+    curScope = &semaCtx.FindScope(source);
     collectScopes(curScope);
   }
   // Collect all symbols referenced in the evaluation being processed,