Disable jit for test

Prevents "Warning: JIT is incompatible with third party extensions that override zend_execute_ex(). JIT disabled. in Unknown on line 0"

Author: staabm

tests/end-to-end/code-coverage/warn-when-opcache-enabled.phpt

@@ -2,6 +2,7 @@
 https://github.com/sebastianbergmann/php-code-coverage/issues/1022
 --INI--
 opcache.enable_cli=1
+opcache.jit=disable
 --SKIPIF--
 <?php declare(strict_types=1);
 require __DIR__ . '/../../_files/skip-if-requires-code-coverage-driver.php';