[php-src] PR #23090: Fix GH-23088: Stack overflow when comparing deeply nested arrays

Pull Request: https://github.com/php/php-src/pull/23090 Author: lazerg Comparing two deeply nested arrays with == recurses through zend_compare -> zend_compare_arrays -> zend_compare_symbol_tables -> zend_hash_compare once per nesting level, and nothing bounds that recursion. zend_hash_compare() only guards against cycles, so a non-cyclic array a few tens of thousands of levels deep runs the C stack out and the process dies with a segfault. zend_compare_symbol_tables() now checks the stack limit before descending and throws an Error instead, the same way zend_std_compare_objects() already handles the object case. Fixes GH-23088