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/Constant.h

@@ -41,6 +41,7 @@ namespace llvm {
 class Constant : public User {
   void operator=(const Constant &);     // Do not implement
   Constant(const Constant &);           // Do not implement
+  virtual void anchor();
   
 protected:
   Constant(Type *ty, ValueTy vty, Use *Ops, unsigned NumOps)