[Bug tree-optimization/120268] Missed removing loop of setting zero when dereference pointer (memset)

[pinskia at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=120268

--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
This is only valid with -fallow-store-data-races. Otherwise you can introduce a
race condition according to the C/C++11 memory model.