[PATCH] Define std::remove_cvref and std::remove_cvref_t for C++2a

[Jonathan Wakely]

On 03/05/18 12:59 +0100, Jonathan Wakely wrote:
>Also define __remove_cvref_t for internal use before C++2a.
>
>	* include/std/any (any_cast): Use __remove_cvref_t.
>	* include/std/tuple (__make_tuple): Likewise.
>	* include/std/type_traits (__remove_cvref_t): Define.
>	(__result_of_memobj, __result_of_memfun): Use __remove_cvref_t.
>	[__cplusplus > 201703L] (remove_cvref, remove_cvref_t): Define.
>	* include/std/variant (__erased_hash): Use __remove_cvref_t.

I forgot to add the tests, here they are.

Tested powerpc64le-linux, committed to trunk.


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