Auto merge of #29788 - mitaa:module_name, r=arielb1

f357d55 caused a regression by retrieving item names from metadata, while previously using the last element of its absolute path (which in the case of a root module is the prefixed crate name since the stored path in metadata is empty)

fixes #28927

src/librustc/metadata/encoder.rs

@@ -1500,7 +1500,7 @@ fn encode_info_for_items<'a, 'tcx>(ecx: &EncodeContext<'a, 'tcx>,
                         &[],
                         CRATE_NODE_ID,
                         [].iter().cloned().chain(LinkedPath::empty()),
-                        syntax::parse::token::special_idents::invalid.name,
+                        syntax::parse::token::intern(&ecx.link_meta.crate_name),
                         hir::Public);
 
     visit::walk_crate(&mut EncodeVisitor {