Don't run Drop terminators on types that do not have drop glue in const eval

Author: JakobDegen

tests/fail/stacked_borrows/drop_in_place_retag.rs

@@ -1,5 +1,5 @@
-//! Test that drop_in_place mutably retags the entire place,
-//! ensuring it is writeable
+//! Test that drop_in_place mutably retags the entire place, even for a type that does not need
+//! dropping, ensuring among other things that it is writeable
 
 //@error-pattern: /retag .* for Unique permission .* only grants SharedReadOnly permission/