Description:
------------
phpgdb from PHP 7.1.0 produces an error, while it works fine on PHP 7.0.11.

Test script:
---------------
#!/bin/bash
/usr/local/zend/bin/phpdbg /var/www/html/simpleEcho.php -a <<< "r simpleEcho.php # quit"

where /var/www/html/simpleEcho.php is simply:
<?php
echo "phpdbg script run fine";
?>

Expected result:
----------------
phpdbg script run fine

Actual result:
--------------
[Welcome to phpdbg, the interactive PHP debugger, v0.5.0]
To get help using phpdbg type "help" and press enter
[Please report bugs to <http://bugs.php.net/report.php>]
[Successful compilation of /var/www/html/simpleEcho.php]
prompt> 
mmap() failed: [22] Invalid argument
[PHP Fatal error:  Out of memory (allocated 2097152) (tried to allocate 18446744073709551615 bytes) in Unknown on line 0]
[Could not find information about included file...]