[Bug ipa/117457] regex global buffer overflow LTO due to IPA constprop and having 2 different string constants across both TU due not merging strings of -fsanitize=address

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=117457

--- Comment #9 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Created attachment 59914
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=59914&action=edit
Reduced testcase

use:
```
-O2 -flto -fsanitize=address --param=lto-min-partition=1
--param=lto-partitions=2
```