2012-02-20  Paolo Carlini  <paolo.carlini@oracle.com>

	PR libstdc++/52241
	* src/c++98/tree.cc (local_Rb_tree_increment,
	local_Rb_tree_decrement): Add.
	(_Rb_tree_increment(const _Rb_tree_node_base*),
	_Rb_tree_decrement(const _Rb_tree_node_base*)): Use the latter.
	(_Rb_tree_increment(_Rb_tree_node_base*),
	_Rb_tree_decrement(_Rb_tree_node_base*)): New.

From-SVN: r184404