Add an endtoend test that covers the case referenced in #2403 (#2442)

Author: andrewmbenton

internal/endtoend/testdata/sqlc_arg/mysql/go/query.sql.go

@@ -5,3 +5,7 @@ SELECT name FROM foo WHERE name = sqlc.arg(slug);
 
 /* name: FuncParamString :many */
 SELECT name FROM foo WHERE name = sqlc.arg('slug');
+
+/* name: Complicated :many */
+WITH names AS (SELECT name from foo WHERE foo.name = sqlc.arg('slug'))
+SELECT name FROM names WHERE name IN (SELECT name FROM foo WHERE foo.name = sqlc.arg('slug'));