bug#41321: 27.0.91; Emacs aborts due to invalid pseudovector objects

[Stefan Monnier]

> But at that point, we already have walked the rbtree, which is
> probably the main performance problem.

Indeed, lisp_maybe_pointer can avoid this cost, but I was more concerned
with the risk of increasing the number of objects kept live because of
false-positives (i.e. a random integer/float/younameit that happens to
look like it's pointing into the object).

> I think the point of maybe_lisp_pointer wasn't to mark fewer objects,
> it was to look up fewer pointers in the rbtree.  I might be wrong.

You might right.


        Stefan