[Bug c/114931] ICE in get_alias_set when building tcl with -std=c23

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=114931

--- Comment #4 from Sam James <sjames at gcc dot gnu.org> ---
```
struct Tcl_Obj;
void(Tcl_FreeInternalRepProc)(struct Tcl_Obj *);
typedef struct Tcl_Obj {
} Tcl_Obj;
struct {
  void (*tclFreeObj)(Tcl_Obj *);
} Tcl_InitStubs;
```