* fold-const.c (swap_tree_comparison): Add support for unordered
	floating point comparisons.
	* tree-vrp.c (opposite_comparison): Delete.
	(extract_range_from_assert): Replace calls to opposite_comparison
	with calls to swap_tree_comparison.
	(register_edge_assert_for): Likewise.
	(vrp_evaluate_conditional): Likewise.

From-SVN: r101201