Zend: fix overflow handling bug in non-x86 fast_add_function()

The 'result' argument of fast_add_function() may alias with either
of its operands (or both). Take care not to write to 'result' before
reading op1 and op2.
Merge branch 'PHP-5.6'
Fixed memory leaks introdused by:
	commit 611da37617749c81ab22b1e44a0cc1f294cc493a
	Author: Igor Wiedler <igor@wiedler.ch>
	Date:   Sat Nov 9 13:48:23 2013 -0500
Merge branch 'PHP-5.6'

* PHP-5.6:
  Fixed memory leaks introdused by: 	commit 611da37617749c81ab22b1e44a0cc1f294cc493a 	Author: Igor Wiedler <igor@wiedler.ch> 	Date:   Sat Nov 9 13:48:23 2013 -0500
Merge branch 'master' of git.php.net:php-src

* 'master' of git.php.net:php-src:
  Zend: fix overflow handling bug in non-x86 fast_add_function()