[Bug c++/125123] mangler issue with 'template for' and 'requires expr'

[waffl3x at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=125123

--- Comment #3 from Alex <waffl3x at gcc dot gnu.org> ---
Reproduced locally, requires -g, does not emit with -O2. I'm not sure
what keyword for add for that.