debug safe iterator patch

Sun Feb 5 17:29:00 GMT 2012

Hi

     Here is a small performance patch for the debug mode. Nothing 
urgent, just tell me if I can apply it on trunk at the moment.

2012-02-05  FranÃ§ois Dumont <fdumont@gcc.gnu.org>

     * include/debug/safe_iterator.h
     (_Safe_iterator::_M_before_dereferenceable): Avoid the expensive
     creation of a _Safe_iterator instance to do the check.

     Tested under x86_64 linux debug mode.

FranÃ§ois
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