get_tree_range should check the supplied range type.

get_tree_range currently checks whether value_range supports the
requested type which is incorrect.  It should check whether the supplied
vrange supports the type.

	* value-query.cc (range_query::get_tree_range): Check if return
	range R supports the expression type.

gcc/value-query.cc

@@ -336,7 +336,7 @@ range_query::get_tree_range (vrange &r, tree expr, gimple *stmt,
   else
     type = TREE_TYPE (expr);
 
-  if (!value_range::supports_type_p (type))
+  if (!r.supports_type_p (type))
     {
       r.set_undefined ();
       return false;