kitsune2_test_utils regression: using pseudo-canonical queries in typeck

[compiler-errors]

https://crater-reports.s3.amazonaws.com/pr-133502-2/try%23da0a4799770027c4c578bf48cdb390acfde09023/reg/kitsune2_test_utils-0.1.3/log.txt

Weird repro but it gets the job done:

struct W<T>(*const T);

impl<T: Send> Clone for W<T> {
    fn clone(&self) -> Self { W(self.0) }
}

impl<T: Send> Copy for W<T> {}

fn main() {
    let coro = async {};
    let x = W(&raw const coro);
    let c = || {
        let x = x;
    };
}

Due to the fact that we strip opaques and generators out of the typing env when checking is_copy_raw, which is done by the expr use visitor.

[compiler-errors]

Should be fixed by tweaks to the stall obligations PR.

[lcnr]

fixed by rust-lang/rust#138845

[lcnr]

opening because I think we didn't add a test for this