[Bug tree-optimization/120341] [15/16 Regregression] wrong code at -O1 and above with "-fallow-store-data-races" on x86_64-linux-gnu

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=120341

--- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
```
DECL_P (base)
&& TREE_READONLY (base)
```

Maybe that should be:
(TREE_CODE (base) == STRING_CST
 || (DECL_P (base) TREE_READONLY (base)))

Or some helper function which does the same.