Description:
------------
PHP crashes when combining $_SERVER with ?: operator once APC is loaded into PHP 5.4.

I used a current SVN checkout of PHP 5.4 and APC, compiled it with --enable-debug and used the builtin webserver to test the script below as follows:

$ gdb --args bin/php -S localhost:8000
(gdb) run
...

$ wget -qO - localhost:8000/
Done.
$ wget -qO - localhost:8000/
<second request hangs>




Reproduce code:
---------------
<?php

$_SERVER['HTTP_HOST'] ?: "foo";
exit("Done.\n");


Expected result:
----------------
Done.
Done.


Actual result:
--------------
Done.

Program received signal SIGSEGV, Segmentation fault.
0x00000000007f0d77 in execute (op_array=0x7ffff7fccdb0) at /home/cschneid/src/php-src-5.4/Zend/zend_vm_execute.h:410
410			if ((ret = OPLINE->handler(execute_data TSRMLS_CC)) > 0) {
(gdb) bt
#0  0x00000000007f0d77 in execute (op_array=0x7ffff7fccdb0) at /home/cschneid/src/php-src-5.4/Zend/zend_vm_execute.h:410
#1  0x00000000007b39be in zend_execute_scripts (type=8, retval=0x0, file_count=3) at /home/cschneid/src/php-src-5.4/Zend/zend.c:1272
#2  0x000000000072a2e1 in php_execute_script (primary_file=0x7fffffffcf90) at /home/cschneid/src/php-src-5.4/main/main.c:2473
#3  0x000000000090751b in php_cli_server_dispatch_script (server=0xeb2e80, client=0x10376f0) at /home/cschneid/src/php-src-5.4/sapi/cli/php_cli_server.c:1869
#4  0x000000000090847a in php_cli_server_dispatch (server=0xeb2e80, client=0x10376f0) at /home/cschneid/src/php-src-5.4/sapi/cli/php_cli_server.c:2030
#5  0x0000000000908b6c in php_cli_server_recv_event_read_request (server=0xeb2e80, client=0x10376f0) at /home/cschneid/src/php-src-5.4/sapi/cli/php_cli_server.c:2208
#6  0x0000000000908eb5 in php_cli_server_do_event_for_each_fd_callback (_params=0x7fffffffd190, fd=7, event=1) at /home/cschneid/src/php-src-5.4/sapi/cli/php_cli_server.c:2294
#7  0x0000000000904383 in php_cli_server_poller_iter_on_active (poller=0xeb2e88, opaque=0x7fffffffd190, callback=0x908cc4 <php_cli_server_do_event_for_each_fd_callback>) at /home/cschneid/src/php-src-5.4/sapi/cli/php_cli_server.c:777
#8  0x0000000000908f78 in php_cli_server_do_event_for_each_fd (server=0xeb2e80, rhandler=0x908aa8 <php_cli_server_recv_event_read_request>, whandler=0x908b93 <php_cli_server_send_event>) at /home/cschneid/src/php-src-5.4/sapi/cli/php_cli_server.c:2320
#9  0x0000000000908fc6 in php_cli_server_do_event_loop (server=0xeb2e80) at /home/cschneid/src/php-src-5.4/sapi/cli/php_cli_server.c:2330
#10 0x00000000009092cf in do_cli_server (argc=3, argv=0x7fffffffe598) at /home/cschneid/src/php-src-5.4/sapi/cli/php_cli_server.c:2431
#11 0x00000000008fdda1 in main (argc=3, argv=0x7fffffffe598) at /home/cschneid/src/php-src-5.4/sapi/cli/php_cli.c:1359