Description:
------------
I have with JIT "Undefined variable" errors in a big application that does not give this error without JIT, 

It happens when there is a global statement of a variable that does not exists, but if I use this construction in a small example script then it works with JIT

./configure --with-apxs2=/usr/bin/apxs2 --with-mysql-sock=/run/mysqld/mysqld.sock --enable-mbstring --enable-exif --enable-ftp --with-zip --enable-soap --with-mysqli --with-pdo-mysql --with-curl --with-openssl --with-zlib --with-bz2 --enable-gd --with-webp --with-jpeg --with-xpm --with-freetype --with-tidy --with-xsl --with-sodium --enable-shmop --with-pspell --with-pear

memory_limit = 2048M
display_errors = on
error_reporting = E_ALL
zend_extension=opcache.so
opcache.enable=1
opcache.enable_cli=1
opcache.jit_buffer_size=128M
extension=memcached.so
extension=yaml.so
zend_extension=xdebug.so
xdebug.mode=debug


Test script:
---------------
<?php

  myFunc ('abc');
  myFunc ('xyz');

  function myFunc ($index) {

    global $myVar;
    
    $myVar [$index] = TRUE;

  }

?>