Auto merge of #80919 - cjgillot:defkey-span, r=oli-obk

Generate metadata by iterating on DefId instead of traversing the HIR tree 1/N

Sample from #80347.

compiler/rustc_passes/src/reachable.rs

@@ -307,6 +307,7 @@ impl<'tcx> ReachableContext<'tcx> {
             | Node::Ctor(..)
             | Node::Field(_)
             | Node::Ty(_)
+            | Node::Crate(_)
             | Node::MacroDef(_) => {}
             _ => {
                 bug!(