[Bug middle-end/112748] memmove(ptr, ptr, n) call optimized out even at -O0 with -fsanitize=undefined

[tavianator at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=112748

--- Comment #2 from Tavian Barnes <tavianator at gmail dot com> ---
(In reply to Andrew Pinski from comment #1)
> Does -fsanitize=address remove it?

Yes, it's still removed with -fsanitize=address.

While ASAN is necessary to check that the memory is really allocated, UBSAN
should at least check that ptr is not NULL.  So it shouldn't be removed in
either case.