[committed] libstdc++: Add std::is_layout_compatible trait for C++20

[Jonathan Wakely]

On 24/08/21 16:13 +0100, Jonathan Wakely wrote:
>Signed-off-by: Jonathan Wakely <jwakely@redhat.com>
>
>libstdc++-v3/ChangeLog:
>
>	* include/std/type_traits (is_layout_compatible): Define.
>	(is_corresponding_member): Define.
>	* include/std/version (__cpp_lib_is_layout_compatible): Define.
>	* testsuite/20_util/is_layout_compatible/is_corresponding_member.cc:
>	New test.
>	* testsuite/20_util/is_layout_compatible/value.cc: New test.
>	* testsuite/20_util/is_layout_compatible/version.cc: New test.
>	* testsuite/20_util/is_pointer_interconvertible/with_class.cc:
>	New test.
>	* testsuite/23_containers/span/layout_compat.cc: Do not use real
>	std::is_layout_compatible trait if available.
>

And the doc patch, also pushed to trunk.


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