Revert "Auto merge of rust-lang#134330 - scottmcm:no-more-rvalue-len, r=matthewjasper"

This reverts commit e108481, reversing
changes made to 303e8bd.

Author: lqd

clippy_utils/src/qualify_min_const_fn.rs

@@ -109,7 +109,7 @@ fn check_rvalue<'tcx>(
 ) -> McfResult {
     match rvalue {
         Rvalue::ThreadLocalRef(_) => Err((span, "cannot access thread local storage in const fn".into())),
-        Rvalue::Discriminant(place) | Rvalue::Ref(_, _, place) | Rvalue::RawPtr(_, place) => {
+        Rvalue::Len(place) | Rvalue::Discriminant(place) | Rvalue::Ref(_, _, place) | Rvalue::RawPtr(_, place) => {
             check_place(tcx, *place, span, body, msrv)
         },
         Rvalue::CopyForDeref(place) => check_place(tcx, *place, span, body, msrv),