[php-src] Issue #12986: `HASH_FLAG_ALLOW_COW_VIOLATION` is not preserved by `zend_hash_real_init_(mixed|packed)_ex()`

Issue: https://github.com/php/php-src/issues/12986 Author: ju1ius ### Description Hi, Currently the [zend_hash_real_init_mixed_ex](https://heap.space/xref/php-src/Zend/zend_hash.c?r=b175ea42#167) and [zend_hash_real_init_packed_ex](https://heap.space/xref/php-src/Zend/zend_hash.c?r=b175ea42#149) functions overwrite the hashtable flags which causes the following example to fail: ```c // allocate a hashtable HashTable *ht = (HashTable*) emalloc(sizeof(HashTable)); _zend_hash_init(ht, HT_MIN_SIZE, NULL, false); // then sometime later: { GC_ADDREF(ht); HT_ALLOW_COW_VIOLATION(ht); zval *value; ZVAL_LONG(value, 1); // HT_ASSERT_RC1(ht) succeeds here because HASH_FLAG_ALLOW_COW_VIOLATION is set. // However, since the hashtable is uninitialized at this point, // zend_hash_real_init_packed_ex() is called after the check, which unsets the flag. zend_hash_next_index_insert(ht, value); ZVAL_LONG(value, 2); // HT_ASSERT_RC1(ht) fails here because HASH_FLAG_ALLOW_COW_VIOLATION // was cleared in the previous step. zend_hash_next_index_insert(ht, value); GC_DELREF(ht); } ``` Would you consider a PR that preserves this flag through the initialization process ? Thanks. ### PHP Version PHP 8.3-dev ### Operating System irrelevant