[Bug c++/107033] [13 Regression] [modules] ICE using span as a range

[johelegp at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=107033

--- Comment #4 from Johel Ernesto Guerrero Peña <johelegp at gmail dot com> ---
This is actually Bug 106826.

Simplest: https://godbolt.org/z/oKT4x9r4G.

```C++
template<class> constexpr bool is = false;
template<class T> constexpr bool is<T&> = true;
```

```C++
export module mod;
import "std.hpp";
static_assert(is<int&>);
```

```
mod.cpp:1:8: internal compiler error: Segmentation fault
    1 | export module mod;
      |        ^~~~~~
0x234bd6e internal_error(char const*, ...)
        ???:0
0xc84cfe walk_specializations(bool, void (*)(bool, spec_entry*, void*), void*)
        ???:0
0xbead4c depset::hash::add_specializations(bool)
        ???:0
0xbfb5a8 module_state::write_begin(elf_out*, cpp_reader*, module_state_config&,
unsigned int&)
        ???:0
0xbfcd45 finish_module_processing(cpp_reader*)
        ???:0
0xb89d2e c_parse_final_cleanups()
        ???:0
0xdb0cc8 c_common_parse_file()
        ???:0
```