PR libstdc++/59872
	* include/bits/stl_map.h (map::operator=(map&&)): Fix comment.
	* include/bits/stl_multimap.h (multimap::operator=(multimap&&)):
	Likewise.
	* include/bits/stl_multiset.h (multiset::operator=(multiset&&)):
	Likewise.
	* include/bits/stl_set.h (set::operator=(set&&)): Likewise.
	* include/bits/stl_tree.h (_Rb_tree::_M_move_data): New overloaded
	functions to perform moving or copying of elements from rvalue tree.
	(_Rb_tree::_Rb_tree(_Rb_tree&&)): Use _M_move_data.
	(_Rb_tree::_Rb_tree(_Rb_tree&&, _Node_allocator&&)): Likewise.
	* testsuite/23_containers/map/59872.cc: New.
	* testsuite/23_containers/map/56613.cc: Remove duplicate include.

From-SVN: r206994