Add a virtual destructor and give vtable a home.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@98376 91177308-0d34-0410-b5e6-96231b3b80d8

include/llvm/Transforms/Utils/BuildLibCalls.h

@@ -106,6 +106,7 @@ namespace llvm {
     virtual bool isFoldable(unsigned SizeCIOp, unsigned SizeArgOp,
                             bool isString) const = 0;
   public:
+    virtual ~SimplifyFortifiedLibCalls();
     bool fold(CallInst *CI, const TargetData *TD);
   };
 }