[GIT-PULLS] [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