store macro def inside macro id

This solves the problem of "macro expansion can't call into name
resolution, because name resolution calls back into macro expansion"

Because we store macro def as a part of call id, macro expansion just
knows the def!

crates/ra_hir/src/code_model_impl/module.rs

@@ -76,7 +76,7 @@ impl Module {
         import: ImportId,
     ) -> TreeArc<ast::PathSegment> {
         let (file_id, source) = self.definition_source(db);
-        let (_, source_map) = db.raw_items_with_source_map(file_id.original_file(db));
+        let (_, source_map) = db.raw_items_with_source_map(file_id);
         source_map.get(&source, import)
     }