Dangling pointers point to everything and nothing

Co-authored-by: Ralf Jung <post@ralfj.de>

compiler/rustc_mir/src/transform/check_consts/validation.rs

@@ -595,8 +595,7 @@ impl Visitor<'tcx> for Validator<'mir, 'tcx> {
                             // Locals with StorageDead are definitely not part of the final constant value, and
                             // it is thus inherently safe to permit such locals to have their
                             // address taken as we can't end up with a reference to them in the
-                            // final value without creating a dangling pointer, which will cause
-                            // errors during validation.
+                            // final value.
                             // Note: This is only sound if every local that has a `StorageDead` has a
                             // `StorageDead` in every control flow path leading to a `return` terminator.
                             if self.local_has_storage_dead(place.local) {