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

[Paul Eggert]

Rich Felker wrote:
> In practice it_might_  work to varying degrees, but it's fundamentally
> fragile and wrong.

Yes, of course. But I don't see how it's any more fundamentally fragile and 
wrong than what we're doing already, as we cannot prevent library functions from 
calling library allocators.

> The dumper can only dump the brk heap that's
> contiguous with .data/.bss (and even that's not contiguous on modern
> hardened kernels).

That should be fixed, then.