[Bug tree-optimization/77899] incorrect VR_RANGE for a signed char function argument

[pinskia at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=77899

--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
This is the complex part because size_type is unsigned so the range converting
from signed [-127, 128] to unsigned is ~[128, 18446744073709551487]