CGClass.cpp: Fix a warning in -Asserts. [-Wunused-private-field]

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@247778 91177308-0d34-0410-b5e6-96231b3b80d8

lib/CodeGen/CGClass.cpp

@@ -1789,6 +1789,7 @@ namespace {
     // Generate function call for handling vtable pointer poisoning.
     void Emit(CodeGenFunction &CGF, Flags flags) override {
       assert(Dtor->getParent()->isDynamicClass());
+      (void)Dtor;
       ASTContext &Context = CGF.getContext();
       // Poison vtable and vtable ptr if they exist for this class.
       llvm::Value *VTablePtr = CGF.LoadCXXThis();