Description:
------------
When I run the test script under PHP 5.6.0alpha1 (downloaded and built today from http://downloads.php.net/tyrael/php-5.6.0alpha1.tar.gz), it causes the php process to crash. I can consistently reproduce this problem on my machine. I've also been able to reproduce it with various builds of PHP 5.5.0.

I've included the backtrace from the crash.

Test script:
---------------
<?php
$bar = new Bar;
$foo = new Foo;
class Bar {
  public function __get($x) {
    global $foo;
    $foo->asd++;
  }
}
class Foo {
  public function __get($x) {
    global $bar;
    $bar->lol++;
  }
}
$foo->blah++;
echo "Done\n";

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


Actual result:
--------------
... the php process crashes, below is the stacktrace from the coredump ...

Core was generated by `/opt/bin/php segv.php'.
Program terminated with signal 11, Segmentation fault.
#0  0x00000000007462ef in zend_post_incdec_property_helper_SPEC_CV_CONST (
    incdec_op=0x6b7db0 <increment_function>, execute_data=0x7f0734740238)
    at /data/users/andrewparoski/php-5.6.0alpha1/Zend/zend_vm_execute.h:32154
32154				Z_OBJ_HT_P(object)->write_property(object, property, z_copy, ((IS_CONST == IS_CONST) ? opline->op2.literal : NULL) TSRMLS_CC);
(gdb) bt
#0  0x00000000007462ef in zend_post_incdec_property_helper_SPEC_CV_CONST (
    incdec_op=0x6b7db0 <increment_function>, execute_data=0x7f0734740238)
    at /data/users/andrewparoski/php-5.6.0alpha1/Zend/zend_vm_execute.h:32154
#1  0x0000000000727f20 in execute_ex (execute_data=0x7f0734740238)
    at /data/users/andrewparoski/php-5.6.0alpha1/Zend/zend_vm_execute.h:363
#2  0x00000000006bb6e9 in zend_execute_scripts (type=8, retval=0x0,
    file_count=3) at /data/users/andrewparoski/php-5.6.0alpha1/Zend/zend.c:1330
#3  0x000000000065bec9 in php_execute_script (primary_file=0x7fffa7647360)
    at /data/users/andrewparoski/php-5.6.0alpha1/main/main.c:2542
#4  0x000000000075e7fc in do_cli (argc=2, argv=0xdd2000)
    at /data/users/andrewparoski/php-5.6.0alpha1/sapi/cli/php_cli.c:994
#5  0x000000000075ef98 in main (argc=2, argv=0xdd2000)
    at /data/users/andrewparoski/php-5.6.0alpha1/sapi/cli/php_cli.c:1378