class AliasSetTracker {
/// CallbackVH - A CallbackVH to arrange for AliasSetTracker to be
/// notified whenever a Value is deleted.
- class ASTCallbackVH : public CallbackVH {
+ class ASTCallbackVH final : public CallbackVH {
AliasSetTracker *AST;
void deleted() override;
void allUsesReplacedWith(Value *) override;