bug#61504: 29.0.60; executing byte-code from previous build causes SIGSEGV crash

[Gregory Heytings]

Thanks for the review!

> The patch is all right, I suppose, but it would be nice to do without 
> the extra cons. Maybe a new specpdl case is warranted? `save-excursion` 
> has one.

That's a possible improvement, but I think it's not safe enough for Emacs 
29.

> By the way, doesn't the patch switch the restoration order of narrowing 
> and restriction, respectively? Maybe it doesn't matter?

Hmmm, that's a good question!  The evaluation order of parameters is 
unspecified in C, so actually the order could be switched or not, 
depending on what the compiler chooses to do.  That being said, AFAICS it 
doesn't matter in this case, indeed.