Fix x86 rep prefix's termination condition
Fix x86 rep prefix's termination condition

programa-stic/barf-project,cnheitman/barf-project,chubbymaggie/barf-project,cnheitman/barf-project,cnheitman/barf-project,chubbymaggie/barf-project,chubbymaggie/barf-project,programa-stic/barf-project