Function merge_hi

publication/code/chapter07/tim_sort.rs:302–307

合并 B、C 为一个 run

(list: &mut [i32], first_len: usize, second_len: usize)

// 合并 B、C 为一个 run
fn merge_hi(list: &mut [i32], first_len: usize, second_len: usize) {
    unsafe {
        let mut state = MergeHi::new(list, first_len, second_len);
        state.merge();
    }
}

// merge_hi 排序状态体
struct MergeHi<'a> {