Avoid comments_before_line

Author: marcandre

lib/rubocop/cop/layout/class_structure.rb

@@ -269,15 +269,11 @@ def end_position_for(node)
         end
 
         def begin_pos_with_comment(node)
-          annotation_line = node.first_line - 1
           first_comment = nil
+          (node.first_line - 1).downto(1) do |annotation_line|
+            break unless (comment = processed_source.comment_at_line(annotation_line))
 
-          processed_source.comments_before_line(annotation_line)
-                          .reverse_each do |comment|
-            if comment.location.line == annotation_line
-              first_comment = comment
-              annotation_line -= 1
-            end
+            first_comment = comment
           end
 
           start_line_position(first_comment || node)