[php-src] PR #23257: Keep EG(errors) buffer consistent on erealloc failure

Pull Request: https://github.com/php/php-src/pull/23257 Author: edorian Update the error count only after the buffer has been resized and the new entry initialized. This prevents fatal error handling from reading past the buffer if reallocating it triggers an OOM bailout. This zend_bailout path is also present in 8.5, the patch there would look like this: ```diff - EG(num_errors)++; - EG(errors) = erealloc(EG(errors), sizeof(zend_error_info*) * EG(num_errors)); - EG(errors)[EG(num_errors)-1] = info; + uint32_t new_num_errors = EG(num_errors) + 1; + EG(errors) = erealloc(EG(errors), sizeof(zend_error_info*) * new_num_errors); + EG(errors)[EG(num_errors)] = info; + EG(num_errors) = new_num_errors; ``` --- If this fix is accepted, should I target 8.5 with a different PR, or what's the best workflow for changes that don't cleanly upmerge? I'm inexperienced in this regard.