Allow dangerous_implicit_autorefs lint in some tests

Author: Urgau

tests/pass/dst-raw.rs

@@ -1,5 +1,7 @@
 // Test DST raw pointers
 
+#![allow(dangerous_implicit_autorefs)]
+
 trait Trait {
     fn foo(&self) -> isize;
 }

tests/pass/stacked-borrows/interior_mutability.rs

@@ -1,3 +1,5 @@
+#![allow(dangerous_implicit_autorefs)]
+
 use std::cell::{Cell, Ref, RefCell, RefMut, UnsafeCell};
 use std::mem::{self, MaybeUninit};