Auto merge of #124863 - DaniPopes:from-str-radix-panic, r=Amanieu

from_str_radix: outline only the panic function

In the `{integer}::from_str_radix` function, the radix check is labeled as `cold` and `inline(never)`, along with its corresponding panic. It probably was intended to apply these attributes only to the panic function.

Author: bors