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This implements most of the remaining C++20 additions to the <iterator> header. * include/bits/iterator_concepts.h (ranges::iter_swap): Fix parameter types of poison pill overload. Use remove_reference_t when checking constraints. * include/bits/stl_iterator.h (move_sentinel): Define for C++20. (move_iterator): Adjust definitions of nested types for C++20. Add hidden friends for move_sentinel operations, iter_move and iter_swap. (common_iterator, counted_iterator): Define for C++20. * testsuite/24_iterators/move_iterator/cust.cc: New test. * testsuite/24_iterators/move_iterator/sentinel.cc: New test. * testsuite/24_iterators/common_iterator/1.cc: New test. * testsuite/24_iterators/counted_iterator/1.cc: New test. Tested powerpc64le-linux, committed to trunk.
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