Description:
------------
I've build PHP7.0.0 from the releases, as well as 7.0.1RC1 to test my sites before upgrading. One of the issues I encountered was the fact that when I use the iconv functions, it crashes the script with a Bus error (core dumped).

iconv is running fine. Both through the command line as well as with PHP5.6.16.

Running the testscript on 7.0.0 or 7.0.1RC1 exits with:
Bus error (core dumped)

In PHP5.6.16 it returns the following response:              
瑥獴獴物湧



Test script:
---------------
<?php 
echo iconv('UTF-16', 'UTF-8', 'teststring');
?>

Expected result:
----------------
瑥獴獴物湧

Actual result:
--------------
Bus error (core dumped)