Optimize String::push_byte()
``` test new_push_byte ... bench: 6985 ns/iter (+/- 487) = 17 MB/s test old_push_byte ... bench: 19335 ns/iter (+/- 1368) = 6 MB/s ``` ```rust extern crate test; use test::Bencher; static TEXT: &'static str = "\ Unicode est un standard informatique qui permet des échanges \ de textes dans différentes langues, à un niveau mondial."; #[bench] fn old_push_byte(bencher: &mut Bencher) { bencher.bytes = TEXT.len() as u64; bencher.iter(|| { let mut new = String::new(); for b in TEXT.bytes() { unsafe { new.as_mut_vec().push_all([b]) } } }) } #[bench] fn new_push_byte(bencher: &mut Bencher) { bencher.bytes = TEXT.len() as u64; bencher.iter(|| { let mut new = String::new(); for b in TEXT.bytes() { unsafe { new.as_mut_vec().push(b) } } }) } ```
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