[kbkpbot]

Fix issue #23928

1. add a field tail in LinkedList[T];
2. use nil instead of 0, use isnil replace some unsafe blocks.
3. add @[heap], @[inline]

list.v

module main

import datatypes
import benchmark

fn main() {
        mut b := benchmark.start()
        mut list := datatypes.LinkedList[int]{}

        for i in 0 .. 10_000_000 {
                list.push(i)
        }
        b.measure('list.push')
}

v -prod list.v
./list
 SPENT   777.296 ms in list.push

[huly-for-github]

Connected to Huly®: V_0.6-22332

[spytheman]

Excellent work.

[medvednikov]

Thanks!

Just wondering, what was the old number?

v -prod list.v
./list
 SPENT   777.296 ms in list.push