Description:
------------
Over 32768 count with foreach loop, some code cause the Segmentation Fault.

Reproduce code:
---------------
<?php
$loop_count = 32768;
$a = array_fill(0, $loop_count, 'foobar');
foreach ($a as $key => $val) {
    $other[$key] = $val;
}
?>

Actual result:
--------------
(gdb) run ~/tmp/php/dbg_loop.php
Starting program: /usr/local/bin/php ~/tmp/php/dbg_loop.php
[New Thread 1024 (LWP 10611)]

Program received signal SIGSEGV, Segmentation fault.
[Switching to Thread 1024 (LWP 10611)]
0x407cfb00 in free () from /lib/libc.so.6

(gdb) bt
#0  0x407cfb00 in free () from /lib/libc.so.6
#1  0x407cfaa3 in free () from /lib/libc.so.6
#2  0x0816618c in shutdown_memory_manager (silent=0, clean_cache=0)
    at /var/src/php-4.3.11/Zend/zend_alloc.c:492
#3  0x0814dfd7 in php_request_shutdown (dummy=0x0)
    at /var/src/php-4.3.11/main/main.c:1004
#4  0x0818bb07 in main (argc=2, argv=0xbffff6e4)
    at /var/src/php-4.3.11/sapi/cli/php_cli.c:879