Rollup merge of rust-lang#99154 - rosehuds:master, r=cjgillot

use PlaceRef::iter_projections to fix old FIXME

I added this function in 53481a5

Author: Dylan-DPC

compiler/rustc_middle/src/mir/visit.rs

@@ -1118,11 +1118,9 @@ macro_rules! visit_place_fns {
             context: PlaceContext,
             location: Location,
         ) {
-            // FIXME: Use PlaceRef::iter_projections, once that exists.
-            let mut cursor = place_ref.projection;
-            while let &[ref proj_base @ .., elem] = cursor {
-                cursor = proj_base;
-                self.visit_projection_elem(place_ref.local, cursor, elem, context, location);
+            for (base, elem) in place_ref.iter_projections().rev() {
+                let base_proj = base.projection;
+                self.visit_projection_elem(place_ref.local, base_proj, elem, context, location);
             }
         }