Function memx::memchr_qpl

pub fn memchr_qpl(
    buf: &[u8],
    by1: u8,
    by2: u8,
    by3: u8,
    by4: u8
) -> Option<usize>

This is same as buf.iter().position(|&x| x == by1 || x == by2 || x == by3 || x == by4).