Need to add a test for marker traits with 'static

[jackh726]

Not sure if we have a test for the following

#![feature(marker_trait_attr)]
#[marker] trait Marker {}
impl Marker for &'static () {}
impl Marker for &'static () {}

and

```rust
#![feature(marker_trait_attr)]
#[marker] trait Marker {}
impl Marker for &'_ () {}
impl Marker for &'_ () {}

If not, we need to add them, since they would be important for special casing 'static during canonicalization.

[Rageking8]

I can help add this test if needed. (Did not rustbot claim so as to not remove lcnr from assignee)

[jackh726]

Sure :) would help out @lcnr if nothing else

[lcnr]

@rustbot assign @Rageking8

[Rageking8]

@rustbot label +F-marker_trait_attr

In case this needs to be indexed in the future.