`__smo` and `__log` intrinsics not correctly compiled and can cause ICE

[ironcev]

__smo and __log intrinsics return unit () but the returned value is not correctly compiled in the IR. Instead of having a const () as their return value they just return their underlaying IR instruction that does not return a value.

E.g. compiling the following script producess ICEs:

script;

fn main() {
    poke(__smo(b256::zero(), 0u64, 0));
    //   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ Internal compiler error: An attempt to get register for unknown Value.
    poke(__log(0u64));
    //   Internal compiler error: An attempt to get register for unknown Value.
}

#[inline(never)]
fn poke<T>(_x: T) {}