* wide-int-range.cc (wide_int_range_convert): New.
	* wide-int-range.h (wide_int_range_convert): New.
	* tree-vrp.c (extract_range_from_unary_expr): Abstract wide int
	code into wide_int_range_convert.
	(extract_range_into_wide_ints): Do not munge anti range constants
	into the entire domain.  Just return the range back.

From-SVN: r264085