[Perl/perl5] 829d30: util.c: Better memory panic messages

[Karl Williamson via perl5-changes]

  Branch: refs/heads/blead
  Home:   https://github.com/Perl/perl5
  Commit: 829d308a92c0e83dfe9608160c8bb96aac40b8c5
      
https://github.com/Perl/perl5/commit/829d308a92c0e83dfe9608160c8bb96aac40b8c5
  Author: Karl Williamson <k...@cpan.org>
  Date:   2023-10-12 (Thu, 12 Oct 2023)

  Changed paths:
    M util.c

  Log Message:
  -----------
  util.c: Better memory panic messages

Before this commit, the readily-available details of the problem weren't
included in the panic messages.

I was struggling to find a bug in this area, and spent a bunch of time,
until I hit on adding this detail to the message; the answer became
quickly apparent.