Add a simpler legacy macro scoping test

crates/hir_def/src/nameres/tests/macros.rs

@@ -335,6 +335,24 @@ mod prelude {
     );
 }
 
+#[test]
+fn legacy_macro_use_before_def() {
+    check(
+        r#"
+m!();
+
+macro_rules! m {
+    () => {
+        struct S;
+    }
+}
+"#,
+        expect![[r#"
+            crate
+        "#]],
+    );
+}
+
 #[test]
 fn plain_macros_are_legacy_textual_scoped() {
     check(