fix(clippy): restore layout_panics reporting to silence dead_code warning

The reporting code was inadvertently dropped when constructing this
commit from the original branch. Without it, LayoutPanic's fields
are never read and clippy -Dwarnings fails.

Author: cds-amal

src/printer/collect.rs

@@ -142,6 +142,16 @@ fn collect_and_analyze_items(
         all_items.push(item);
     }
 
+    if !ty_visitor.layout_panics.is_empty() {
+        eprintln!(
+            "warning: {} type layout(s) could not be computed (rustc panicked):",
+            ty_visitor.layout_panics.len()
+        );
+        for panic in &ty_visitor.layout_panics {
+            eprintln!("  type {:?}: {}", panic.ty, panic.message);
+        }
+    }
+
     (
         CollectedCrate {
             items: all_items,