Unweaken vtables as per http://llvm.org/docs/CodingStandards.html#ll_virtual_anch

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@146960 91177308-0d34-0410-b5e6-96231b3b80d8

include/llvm/Argument.h

@@ -30,6 +30,7 @@ template<typename ValueSubClass, typename ItemParentClass>
 /// the function was called with.
 /// @brief LLVM Argument representation  
 class Argument : public Value, public ilist_node<Argument> {
+  virtual void anchor();
   Function *Parent;
 
   friend class SymbolTableListTraits<Argument, Function>;