Unrolled build for #143467

Rollup merge of #143467 - ChaiTRex:ascii_char_is_ascii, r=tgross35

Add ASCII-related methods from `u8` and `MIN`/`MAX` to `core::ascii::Char`

* Add ASCII-related methods from `u8` to `core::ascii::Char`.
* Add `core::ascii::Char::MIN` and `core::ascii::Char::MAX`.

Author: rust-timer