cgen: fix necessary clone when the closure param is string/array on autofree(fix #20498)

[shove70]

1. Fixed Closure capturing an array results in use-after-free with autofree #20498
2. Add tests.

fn foo() fn() {
    arr := [1, 2, 3]
    return fn [arr] () {
        println(arr)
    }
}

fn main() {
    print_arr := foo()
    print_arr()
}

v -autofree run a.v

[1, 2, 3]

[spytheman]

Excellent work.