diff --git a/clang/lib/CodeGen/CGStmtOpenMP.cpp b/clang/lib/CodeGen/CGStmtOpenMP.cpp
--- a/clang/lib/CodeGen/CGStmtOpenMP.cpp
+++ b/clang/lib/CodeGen/CGStmtOpenMP.cpp
@@ -971,7 +971,7 @@
   // operator=(threadprivate_var2, master_threadprivate_var2);
   // ...
   // __kmpc_barrier(&loc, global_tid);
-  llvm::DenseSet<const VarDecl *> CopiedVars;
+  llvm::SetVector<const VarDecl *> CopiedVars;
   llvm::BasicBlock *CopyBegin = nullptr, *CopyEnd = nullptr;
   for (const auto *C : D.getClausesOfKind<OMPCopyinClause>()) {
     auto IRef = C->varlist_begin();
@@ -980,7 +980,7 @@
     for (const Expr *AssignOp : C->assignment_ops()) {
       const auto *VD = cast<VarDecl>(cast<DeclRefExpr>(*IRef)->getDecl());
       QualType Type = VD->getType();
-      if (CopiedVars.insert(VD->getCanonicalDecl()).second) {
+      if (CopiedVars.insert(VD->getCanonicalDecl())) {
         // Get the address of the master variable. If we are emitting code with
         // TLS support, the address is passed from the master as field in the
         // captured declaration.