[php-src] Issue #9196: dl() breaks expectations regarding permanent or interned strings

Issue: https://github.com/php/php-src/issues/9196 Author: arnaud-lb ### Description Extensions loaded during a dl() call will try to allocate persistent interned strings for class names, function names, ini entries, etc. Normally, [this is not allowed](https://github.com/php/php-src/blob/9e2de4c2d95b0a391f85121d0d077c8d6d5fdcae/Zend/zend_string.c#L239-L245) during a request. The default in-request implementation of zend_string_init_interned still allows it, but the opcache implementation will simply [return a non-interned string](https://github.com/php/php-src/blob/9e2de4c2d95b0a391f85121d0d077c8d6d5fdcae/ext/opcache/ZendAccelerator.c#L609-L614). Calling dl() breaks in RC_DEBUG builds: https://github.com/php/php-src/pull/8606 This also breaks internal enums. The test in this branch will crash in debug builds: https://github.com/php/php-src/compare/master...arnaud-lb:php-src:internal-enums-dl-crash?expand=1 ### PHP Version PHP 8.0 ### Operating System _No response_