[Bug c++/120275] [12/13/14/15/16 Regression] ICE in write_type at cp/mangle.cc:2687 when using decltype(auto) with initializer list since 11.3

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=120275

--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Reduced with only one header:
```
#include <initializer_list>
int main()
{
    decltype(auto) values = {1, 2, 3, 4};
    values.size()
}
```