Rollup merge of #96124 - gilescope:to_digit_speedup4, r=thomcc

to_digit tweak

No need to check the assert all the time.

(Checked the TODO and it's not time to get rid of it yet)

library/core/src/char/methods.rs

@@ -343,10 +343,10 @@ impl char {
  without modifying the original"]
  #[inline]
  pub const fn to_digit(self, radix: u32) -> Option<u32> {
- assert!(radix <= 36, "to_digit: radix is too high (maximum 36)");
  // If not a digit, a number greater than radix will be created.
  let mut digit = (self as u32).wrapping_sub('0' as u32);
  if radix > 10 {
+ assert!(radix <= 36, "to_digit: radix is too high (maximum 36)");
  if digit < 10 {
  return Some(digit);
  }