[Bug middle-end/126240] ranger: frange cannot represent the inverse of a floating point constant

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=126240

--- Comment #7 from Drea Pinski <pinskia at gcc dot gnu.org> ---
Having a two sub ranges will solve the bug is filed about -0.0 also.

Make sure when we add that we fix up int to float conversion to produce the
range without -0.0.