re PR tree-optimization/83418 (ICE in extract_range_for_var_from_comparison_expr, at vr-values.c:448)

2017-12-14  Richard Biener  <rguenther@suse.de>

	PR tree-optimization/83418
	* vr-values.c (vr_values::extract_range_for_var_from_comparison_expr):
	Instead of asserting we don't get unfolded comparisons deal with
	them.

	* gcc.dg/torture/pr83418.c: New testcase.

From-SVN: r255628