* vr-values.h (get_output_for_vrp): Prototype.
	* vr-values.c (get_output_for_vrp): New function extracted from
	vrp_visit_assignment_or_call and extract_range_from_stmt.
	(vrp_visit_assignment_or_call): Use get_output_for_vrp.  Simplify.

From-SVN: r254880