[Bug c++/113565] __builtin_clz(0) is undefined behavior, but not detected in constant expressions

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=113565

Jonathan Wakely <redi at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Severity|normal                      |enhancement

--- Comment #3 from Jonathan Wakely <redi at gcc dot gnu.org> ---
I'm not sure it's reasonable to expect an error here. The C++ standard says
nothing about whether __builtin_clz is a constant expression, obviously.

So I'm changing this to severity=enhancement.