[Bug c++/108099] ICE with type alias with `signed __int_128_t`

[pinskia at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=108099

Andrew Pinski <pinskia at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Summary|ICE when parsing signed     |ICE with type alias with
                   |__int128_t typedef          |`signed __int_128_t`

--- Comment #5 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
This is interesting:
```
typedef __int128_t t;
using i128 = signed t;
//using i128_1 = signed __int128_t;
```
The above does not cause an ICE only a direct use of __int128_t causes the ICE
(with -pedantic we do warn about signed being used with the typedef though).