Use perfect forwarding in std::function invokers.
* include/std/functional: (_Function_base::_Function_base()): Use nullptr instead of literal zero. (function::operator=(nullptr_t)): Likewise. (_Function_handler::_M_invoke): Use perfect forwarding for _ArgTypes. (function::_Invoker_type): Likewise. * testsuite/20_util/function/invoke/forwarding.cc: New. From-SVN: r216849
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