Fix memleak in generators using symtable

Zend/tests/generators/generator_symtable_leak.phpt

@@ -0,0 +1,20 @@
+--TEST--
+Generators using symtables must not leak
+--FILE--
+<?php
+
+function gen() {
+	$bar = ["some complex var"];
+	${"f"."oo"} = "force symtable usage";
+	var_dump($bar);
+	yield;
+}
+
+gen()->valid();
+
+?>
+--EXPECT--
+array(1) {
+  [0]=>
+  string(16) "some complex var"
+}

Zend/zend_generators.c

@@ -104,11 +104,11 @@ ZEND_API void zend_generator_close(zend_generator *generator, zend_bool finished
 	if (generator->execute_data) {
 		zend_execute_data *execute_data = generator->execute_data;
 
-		if (!execute_data->symbol_table) {
-			zend_free_compiled_variables(execute_data);
-		} else {
+		if (execute_data->symbol_table) {
 			zend_clean_and_cache_symbol_table(execute_data->symbol_table);
 		}
+		/* always free the CV's, in the symtable are only not-free'd IS_INDIRECT's */
+		zend_free_compiled_variables(execute_data);
 
 		if (Z_OBJ(execute_data->This)) {
 			OBJ_RELEASE(Z_OBJ(execute_data->This));