Constants not correctly aligned

```
fn main() {
    let slice = &[0, 1] as &[i32];
    unsafe { std::slice::from_raw_parts(slice as *const [i32] as *const i32, 1); }
}
```

```
thread 'main' panicked at 'attempt to create unaligned slice', sysroot_src/src/libcore/slice/mod.rs:4892:5
```