fix errors and warnings

Author: akuhlens

flang/include/flang/Lower/OpenACC.h

@@ -38,7 +38,7 @@ class FirOpBuilder;
 
 namespace Fortran {
 namespace evaluate {
-class ProcedureDesignator;
+struct ProcedureDesignator;
 } // namespace evaluate
 
 namespace parser {

flang/lib/Semantics/resolve-directives.cpp

@@ -3040,6 +3040,4 @@ void OmpAttributeVisitor::IssueNonConformanceWarning(
   context_.Warn(common::UsageWarning::OpenMPUsage, source, "%s"_warn_en_US,
       warnStrOS.str());
 }
-} // namespace Fortran::semantics
-
-} // namespace Fortran::semantics
+} // namespace Fortran::semantics

flang/lib/Semantics/symbol.cpp

@@ -146,7 +146,7 @@ llvm::raw_ostream &operator<<(
   }
   if (!x.openACCRoutineInfos_.empty()) {
     os << " openACCRoutineInfos:";
-    for (const auto x : x.openACCRoutineInfos_) {
+    for (const auto &x : x.openACCRoutineInfos_) {
       os << x;
     }
   }