Re: Add 64-bit XIDs into PostgreSQL 15

Hi!

I attach an additional V48-0009 patch as they are just comments, apply it
> if you want to.
>
Big thank you for your review. I've applied your addition in the recent
patch set below.

Besides, mentioned above, next changes are made:
- rename HeapTupleCopyBaseFromPage to HeapTupleCopyXidsFromPage, since this
old name came from the time when еру "t_xid_base" was stored in tuple,
and not correspond to recent state of the code;
- replace ToastTupleHeader* calls with HeapHeader* with the "is_toast"
argument. This reduces diff and make the code more readable;
- put HeapTupleSetZeroXids calls in several places for the sake of
redundancy;
- in heap_tuple_would_freeze add case to reset xmax without reading clog;
- rename SeqTupleHeaderSetXmax/Xmin to SeqTupleSetXmax/min and refactoring
of the function; Now it will set HeapTuple and HeapTupleHeader xmax;
- add case of int64 values in check_GUC_init;
- massive refactoring in htup_details.h to use inline functions with type
control over macro;
- reorder code in htup_details.h to reduce overall diff.

As always, reviews and opinions are very welcome!

--
Best regards,
Maxim Orlov.