[patch] libstdc++/59768 Fix std::invoke support for reference_wrappers

[Jonathan Wakely]

On 11/12/15 21:43 +0000, Jonathan Wakely wrote:
>    Fix std::invoke support for reference_wrappers
>    
>    	PR libstdc++/59768
>    	* include/std/functional (_Unwrap, __invfwd): Define.
>    	(__invoke_impl): Remove reference_wrapper overloads and use __invfwd.
>    	* include/std/type_traits (__result_of_memobj, __result_of_memfun):
>    	Add partial specializations for const reference_wrappers and simplify.
>    	* testsuite/20_util/bind/ref_neg.cc: Use dg-excess-errors.
>    	* testsuite/20_util/function_objects/invoke/59768.cc: New.

This change was missing an inline specifier on the new __invfwd
function template.

Tested ppc64le-linux, committed to trunk.

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