Allow dangerous_implicit_autorefs lint in some tests

Author: Urgau

src/tools/miri/tests/pass/dst-raw.rs

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

tests/ui/dynamically-sized-types/dst-raw.rs

@@ -1,8 +1,8 @@
 //@ run-pass
 // Test DST raw pointers
 
-
 #![feature(unsized_tuple_coercion)]
+#![allow(dangerous_implicit_autorefs)]
 
 trait Trait {
     fn foo(&self) -> isize;