autodoc: update to new func zir body structure

this is a hack meant to restore functionality for the upcoming release,
a proper analysis of the new zir structure is required to make a robust
change.

lib/docs/main.js

@@ -449,6 +449,8 @@ var zigAnalysis;
       currentType = childDecl;
       curNav.declObjs.push(currentType);
     }
+    
+    window.x = currentType;
 
     renderNav();