Add clear_each to LockFreeStack
Add clear_each to LockFreeStack

MadBomber/concurrent-ruby,lucasallan/concurrent-ruby,hobodave/concurrent-ruby,hobodave/concurrent-ruby,lucasallan/concurrent-ruby,lucasallan/concurrent-ruby,MadBomber/concurrent-ruby,lucasallan/concurrent-ruby,hobodave/concurrent-ruby,MadBomber/concurrent-ruby,MadBomber/concurrent-ruby,lucasallan/concurrent-ruby,hobodave/concurrent-ruby