Jonathan Wakely 6d188e4fdd Make std::invoke usable in constant expressions
* include/std/functional (invoke): Add constexpr for C++20.
	* include/std/version (__cpp_lib_constexpr_invoke): Define.
	* testsuite/20_util/function_objects/invoke/constexpr.cc: New test.

From-SVN: r277343
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