Fixed possible assertion/crash when PHP script can't be stored in SHM (e.g. because another process already did this)

Author: dstogov

ext/opcache/zend_accelerator_util_funcs.c

@@ -581,7 +581,7 @@ static void zend_accel_class_hash_copy(HashTable *target, HashTable *source)
 	p = source->arData;
 	end = p + source->nNumUsed;
 	for (; p != end; p++) {
-		ZEND_ASSERT(Z_TYPE(p->val) != IS_UNDEF);
+		if (UNEXPECTED(Z_TYPE(p->val) == IS_UNDEF)) continue;
 		ZEND_ASSERT(p->key);
 		t = zend_hash_find_ex(target, p->key, 1);
 		if (UNEXPECTED(t != NULL)) {