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/CodeGen/TargetLoweringBase.cpp b/llvm/lib/CodeGen/TargetLoweringBase.cpp
index 27630a3..fc14763 100644
--- a/llvm/lib/CodeGen/TargetLoweringBase.cpp
+++ b/llvm/lib/CodeGen/TargetLoweringBase.cpp
@@ -1818,7 +1818,7 @@
   Module *M = IRB.GetInsertBlock()->getParent()->getParent();
   Type *StackPtrTy = Type::getInt8PtrTy(M->getContext());
   Value *Fn = M->getOrInsertFunction("__safestack_pointer_address",
-                                     StackPtrTy->getPointerTo(0));
+                                     StackPtrTy->getPointerTo(0), nullptr);
   return IRB.CreateCall(Fn);
 }