Revert "Turn some C-style vararg into variadic templates"

This reverts commit r299699, the examples needs to be updated.

llvm-svn: 299702
diff --git a/llvm/lib/Transforms/IPO/WholeProgramDevirt.cpp b/llvm/lib/Transforms/IPO/WholeProgramDevirt.cpp
index 3ac542b..2579528 100644
--- a/llvm/lib/Transforms/IPO/WholeProgramDevirt.cpp
+++ b/llvm/lib/Transforms/IPO/WholeProgramDevirt.cpp
@@ -1220,8 +1220,8 @@
   if (Res.TheKind == WholeProgramDevirtResolution::SingleImpl) {
     // The type of the function in the declaration is irrelevant because every
     // call site will cast it to the correct type.
-    auto *SingleImpl = M.getOrInsertFunction(Res.SingleImplName,
-                                             Type::getVoidTy(M.getContext()));
+    auto *SingleImpl = M.getOrInsertFunction(
+        Res.SingleImplName, Type::getVoidTy(M.getContext()), nullptr);
 
     // This is the import phase so we should not be exporting anything.
     bool IsExported = false;