[Bug libstdc++/94295] use __builtin_operator_new and __builtin_operator_delete when available

[glisse at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94295

Marc Glisse <glisse at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
           Keywords|                            |missed-optimization
   Last reconfirmed|                            |2020-03-26
           Severity|normal                      |enhancement
     Ever confirmed|0                           |1