bug#54098: 29.0.50; Unexec build broken

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

Alan Mackenzie <acm@muc.de> writes:

> I've changed approach.  The previous code was continually overwriting
> Lisp objects with themselves, particularly where it didn't need doing.
> This is surely (??) what was happening in the pure storage.
>
> I've rewritten byte-run-strip-symbol-positions, so that changes are only
> attempted where they're needed, i.e. where a symbol with position gets
> replaced by its bare symbol.
>
> I'm hoping that this will now work OK, though I don't have a setup using
> unexec to test it with.  Would you please test it.
>
> I'm tending to the view that we need to make this function available to
> Lisp hackers.  I think we need both varieties of the function (the one
> that makes a copy, and the one that modifies in situ), and that they
> should be called simply strip-symbol-positions and
> n-strip-symbol-positions (like reverse and nreverse).
>
> Anyhow, here's the patch:

Bootstrapping an unexec build works now with your patch.  Thanks.