[Bug middle-end/108448] GCC Elides Assignment to Pointer and memcpy

[sjames at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=108448

--- Comment #13 from Sam James <sjames at gcc dot gnu.org> ---
(In reply to Sam James from comment #12)
> I suspect this is abuse of __attribute__((malloc)).

y_stackpool_malloc returns a value derived from input `p`.