bug#61847: debug-early-backtrace only works some of the time.

[Stefan Monnier via "Bug reports for GNU Emacs, the Swiss army knife of text editors" <bug-gnu-emacs@gnu.org>]

> the way it prints (or rather used to print) a compiled function is/was
> useful.  You can see how many arguments it takes.

Hmm...

`prin1` will print for example #[256 ...] where 256 is where it tells
"how many arguments it takes".
In contrast, `cl-prin1` will print #f(compiled-function (&optional arg) ...)

So in both cases "you can see how many arguments it takes" (and I'll
let you guess which one I find more readable).

FWIW, I just tried the `condition-case` wrapper and it fixes the problem
for the test case you showed.  So I just pushed my patch to
`emacs-29` (which additionally checks for the presence of
`cl-defmethod`, which also fixes the problem: one is never too sure).

I'll let you (plural) decide whether to keep using `cl-prin1` or not,
but now this is not directly related to fixing this bug any more.


        Stefan