bug#22086: 25.1.50; [PATCH] Integrate the musl hybrid malloc patch for elf systems

[Paul Eggert]

Rich Felker wrote:
> I don't object to this change if you can reliably ensure that nothing
> in the pre-dump emacs will call malloc.

We can't reliably ensure that, I'm afraid, as Emacs might call some library 
function that in turn calls malloc. It might be a 3rd-party library that Emacs 
has no control over.

Why can't pre-dump emacs call malloc? Is it a performance thing or a correctness 
thing? If a performance thing it shouldn't be much of a problem, as we can 
arrange for Emacs to never directly call malloc, and that should be the vast 
majority of the calls.