[Bug c/88566] -Wconversion not using value range information

[pinskia at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=88566

--- Comment #3 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
This is a non flow sensitive warning.  There are a bunch were are not; flow
sensitivity would make this warning worse not better in my mind as it means in
inlining would cause correct warnings to disappear.