Use ZEND_MM in debug mode instead of alloca

Author: Girgias

Zend/zend_portability.h

@@ -345,7 +345,7 @@ char *alloca();
 # define XtOffsetOf(s_type, field) offsetof(s_type, field)
 #endif
 
-#if (defined(HAVE_ALLOCA) || (defined (__GNUC__) && __GNUC__ >= 2)) && !(defined(ZTS) && defined(HPUX)) && !defined(DARWIN)
+#if !ZEND_DEBUG && (defined(HAVE_ALLOCA) || (defined (__GNUC__) && __GNUC__ >= 2)) && !(defined(ZTS) && defined(HPUX)) && !defined(DARWIN)
 # define ZEND_ALLOCA_MAX_SIZE (32 * 1024)
 # define ALLOCA_FLAG(name) \
 	bool name;