Description:
------------
Calling non-existent or private static method in __callStatic magic method 
(infinite function call loop) causes segfault.

Also reproducible on older 5.3.x versions on all platforms.

Test script:
---------------
<?php

class Foo {
	public static function __callStatic($a, $b) {
		self::bar();
	}
}

Foo::bar();

Expected result:
----------------
Fatal error: Allowed memory size of xxx bytes exhausted

Actual result:
--------------
Segmentation fault.

Backtrace from cordeump:
#0  0x00000000006e46f6 in instanceof_function ()
#1  0x00000000006fbfae in zend_call_method ()
#2  0x00000000007081b4 in zend_std_callstatic_user_call ()
#3  0x00000000007538bd in zend_do_fcall_common_helper_SPEC ()
#4  0x000000000070bdd8 in execute ()
#5  0x00000000006db8b1 in zend_call_function ()
#6  0x00000000006fbfeb in zend_call_method ()
#7  0x00000000007081b4 in zend_std_callstatic_user_call ()
#8  0x00000000007538bd in zend_do_fcall_common_helper_SPEC ()
#9  0x000000000070bdd8 in execute ()
... last 5 lines repeat ...
#23750 0x00000000006db8b1 in zend_call_function ()
#23751 0x00000000006fbfeb in zend_call_method ()
#23752 0x00000000007081b4 in zend_std_callstatic_user_call ()
#23753 0x00000000007538bd in zend_do_fcall_common_helper_SPEC ()
#23754 0x000000000070bdd8 in execute ()
#23755 0x00000000006e82ed in zend_execute_scripts ()
#23756 0x000000000068dffc in php_execute_script ()
#23757 0x0000000000774012 in do_cli ()
#23758 0x000000000077302d in main ()