[Bug c++/92642] Enhance shift-count-overflow output

[redi at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92642

--- Comment #3 from Jonathan Wakely <redi at gcc dot gnu.org> ---
No, not necessarily.


extern const int n; // defined in another file
auto i = 1 << n;

void f(const int n)
{
  auto i = 1 << n;
}

Not all const variables are compile-time constants.