[Bug tree-optimization/115771] false postiv -Wstringop-overread with -O2

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=115771

--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Note the testcase needs:
```
#include <cstdint>

```
for newer gcc versions.