Description:
------------
When a directory symlink is changed to a new target directory and the new target contains file names that were also in the old target directory, OPcache sometimes returns the old file instead of the new file.

lrwxrwxrwx 1 root root     2 Mar 17 20:28 v -> v1
-rw-r--r-- 1 root root    60 Mar 17 20:22 test.php
drwxr-xr-x 2 root root  4096 Mar 17 20:22 v2
drwxr-xr-x 2 root root  4096 Mar 17 20:21 v1

Both v1 and v2 contain home.php with different contents

Changing the symlink v from v1 to v2 does not always cause the desired result.  Sometimes OPcache alternates between the two different home.php pages.

Using FPM/FastCGI with PHP Version 7.1.3-2+deb.sury.org~xenial+1
Same problem using PHP Version 7.0.15

Test script:
---------------
test.php:
<?php
echo "This is test.php\n";
include("v/home.php");
?>

v1/home.php:
<?php
echo "This is v1/home.php\n";

v2/home.php:
<?php
echo "This is v2/home.php\n";