Fix assert with attribute + first-class callable in assert

This is going to result in a compile-time error, but AST printing
is invoked first and should handle it gracefully. Handle it by
falling back to more generic printing code.

Fixes oss-fuzz #36264.

Author: nikic

Zend/tests/first_class_callable_assert2.phpt

@@ -0,0 +1,11 @@
+--TEST--
+Foo(...) in attribute in assert
+--FILE--
+<?php
+assert(function() {
+    #[Foo(...)]
+    class Test {}
+});
+?>
+--EXPECTF--
+Fatal error: Cannot create Closure as attribute argument in %s on line %d

Zend/zend_ast.c

@@ -1480,9 +1480,7 @@ static ZEND_COLD void zend_ast_export_class_no_header(smart_str *str, zend_ast_d
 
 static ZEND_COLD void zend_ast_export_attribute_group(smart_str *str, zend_ast *ast, int indent) {
 	zend_ast_list *list = zend_ast_get_list(ast);
-	uint32_t i, j;
-
-	for (i = 0; i < list->children; i++) {
+	for (uint32_t i = 0; i < list->children; i++) {
 		zend_ast *attr = list->child[i];
 
 		if (i) {
@@ -1491,15 +1489,8 @@ static ZEND_COLD void zend_ast_export_attribute_group(smart_str *str, zend_ast *
 		zend_ast_export_ns_name(str, attr->child[0], 0, indent);
 
 		if (attr->child[1]) {
-			zend_ast_list *args = zend_ast_get_list(attr->child[1]);
-
 			smart_str_appendc(str, '(');
-			for (j = 0; j < args->children; j++) {
-				if (j) {
-					smart_str_appends(str, ", ");
-				}
-				zend_ast_export_ex(str, args->child[j], 0, indent);
-			}
+			zend_ast_export_ex(str, attr->child[1], 0, indent);
 			smart_str_appendc(str, ')');
 		}
 	}