Always go through the expn_that_defined query.

compiler/rustc_middle/src/query/mod.rs

@@ -212,6 +212,7 @@ rustc_queries! {
 
     /// Internal helper query. Use `tcx.expansion_that_defined` instead
     query expn_that_defined(key: DefId) -> rustc_span::ExpnId {
+        eval_always
         desc { |tcx| "expansion that defined `{}`", tcx.def_path_str(key) }
     }