Not optimized codegen with NonZeroI32

[crlf0710]

This code:

use std::num::NonZeroI32;

pub fn div(a: i16, b: NonZeroI32) -> (i32, i32) {
    let a = a as i32;
    let b = b.get();
    (a / b, a % b)
}

should have no possibility of panicking by "divide by zero", however, it seems related check and panicking code is still generated.

[uenoku]

It is a longstanding problem: #49572

[jonas-schievink]

Closing in favor of #49572