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Some more C++20 changes from P1614R2, "The Mothership has Landed". This implements <=> for sequence containers (and the __normal_iterator and _Pointer_adapter class templates). * include/bits/forward_list.h (forward_list): Define operator<=> and remove redundant comparison operators for C++20. * include/bits/stl_bvector.h (vector<bool, Alloc>): Likewise. * include/bits/stl_deque.h (deque): Likewise. * include/bits/stl_iterator.h (__normal_iterator): Likewise. * include/bits/stl_list.h (list): Likewise. * include/bits/stl_vector.h (vector): Likewise. * include/debug/deque (__gnu_debug::deque): Likewise. * include/debug/forward_list (__gnu_debug::forward_list): Likewise. * include/debug/list (__gnu_debug::list): Likewise. * include/debug/safe_iterator.h (__gnu_debug::_Safe_iterator): Likewise. * include/debug/vector (__gnu_debug::vector): Likewise. * include/ext/pointer.h (__gnu_cxx::_Pointer_adapter): Define operator<=> for C++20. * testsuite/23_containers/deque/operators/cmp_c++20.cc: New test. * testsuite/23_containers/forward_list/cmp_c++20.cc: New test. * testsuite/23_containers/list/cmp_c++20.cc: New test. * testsuite/23_containers/vector/bool/cmp_c++20.cc: New test. * testsuite/23_containers/vector/cmp_c++20.cc: New test.
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