Added test to repo standard assign not work witn extension enabled.

some info from gdb and coredump

```
(gdb) bt
#0  0x00000000008dc094 in _zend_is_inconsistent (ht=0x0, file=0xe7cf38 "/opt/phpfarm/src/php-5.4.16-debug/Zend/zend_hash.c", line=946)
    at /opt/phpfarm/src/php-5.4.16-debug/Zend/zend_hash.c:54
#1  0x00000000008ded38 in zend_hash_quick_find (ht=0x0, arKey=0x7ffff7eb9e28 "loader", nKeyLength=7, h=229473782970300, pData=0x7ffff7f92360)
    at /opt/phpfarm/src/php-5.4.16-debug/Zend/zend_hash.c:946
#2  0x00007ffff667e12f in php_operator_zval_ptr (optype=16 '\020', node_op=0x7ffff7e01e40, should_free=0x7fffffffa3b0, 
    execute_data=0x7ffff7f922d0, silent=1 '\001') at /opt/phpfarm/pecl-php-operator/operator.c:93
#3  0x00007ffff667eabb in _php_operator_binary_assign_op (execute_data=0x7ffff7f922d0, methodname=0x7ffff6680687 "__assign", 
    methodname_len=8) at /opt/phpfarm/pecl-php-operator/operator.c:357
#4  0x00007ffff667f38f in php_operator_op_ZEND_ASSIGN (execute_data=0x7ffff7f922d0) at /opt/phpfarm/pecl-php-operator/operator.c:473
#5  0x0000000000906727 in execute (op_array=0x7ffff7e003c0) at /opt/phpfarm/src/php-5.4.16-debug/Zend/zend_vm_execute.h:410
#6  0x00000000008ccd03 in zend_execute_scripts (type=8, retval=0x0, file_count=3) at /opt/phpfarm/src/php-5.4.16-debug/Zend/zend.c:1315
#7  0x000000000084309e in php_execute_script (primary_file=0x7fffffffc990) at /opt/phpfarm/src/php-5.4.16-debug/main/main.c:2494
#8  0x000000000096e118 in do_cli (argc=2, argv=0x7fffffffdde8) at /opt/phpfarm/src/php-5.4.16-debug/sapi/cli/php_cli.c:988
#9  0x000000000096f2d9 in main (argc=2, argv=0x7fffffffdde8) at /opt/phpfarm/src/php-5.4.16-debug/sapi/cli/php_cli.c:1364
```