workaround for gcc bug with placement new: v6

Co-authored-by: A. Jiang <[email protected]>

Author: PaulXiCao

libcxx/include/__algorithm/stable_sort.h

@@ -124,9 +124,9 @@ _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX26 void __merge_move_construct(
     } else {
 // __STABLE_SORT_NEW(__result, value_type, _Ops::__iter_move, __first1);
 #if !defined(__clang__) && defined(__GNUC__) && (__GNUC__ * 10000 + __GNUC_MINOR__ * 100 <= 140100)
-      [__result, &__first1] { ::new (__result) value_type(_Ops::__iter_move(__first1)); }();
+      [__result, &__first1] { ::new ((void*)__result) value_type(_Ops::__iter_move(__first1)); }();
 #else
-      ::new (__result) value_type(_Ops::__iter_move(__first1));
+      ::new ((void*)__result) value_type(_Ops::__iter_move(__first1));
 #endif
       __d.template __incr<value_type>();
       ++__first1;