Fix memory leak complicated non-type template arguments.

Author: zygoloid

clang/include/clang/AST/ASTContext.h

@@ -2818,8 +2818,8 @@ class ASTContext : public RefCountedBase<ASTContext> {
   /// for destruction.
   template <typename T> void addDestruction(T *Ptr) const {
     if (!std::is_trivially_destructible<T>::value) {
-      auto DestroyPtr = [](void *V) { static_cast<T *>(V)->~T(); };
-      AddDeallocation(DestroyPtr, Ptr);
+      auto DestroyPtr = [](void *V) { ((T*)V)->~T(); };
+      AddDeallocation(DestroyPtr, (void*)Ptr);
     }
   }
 

clang/lib/AST/TemplateBase.cpp

@@ -137,6 +137,7 @@ TemplateArgument::TemplateArgument(const ASTContext &Ctx, QualType Type,
   else {
     Value.Kind = UncommonValue;
     Value.Value = new (Ctx) APValue(V);
+    Ctx.addDestruction(Value.Value);
     Value.Type = Type.getAsOpaquePtr();
   }
 }