Add test for stack overflow in Util#class_name

test/apps/rails4/app/controllers/another_controller.rb

+class AnotherController < ApplicationController
+  def overflow
+    @test = @test.where.all
+  end
+end

test/apps/rails4/app/views/another/overflow.html.erb

+<% @test.each do |i| %>
+  <%= i %>
+<% end %>