* infrun.c (cleanup_displaced_step_closure): Remove.

	* infrun.c (cleanup_displaced_step_closure): Remove.
	(displaced_step_clear_cleanup): Move to before displaced_step_prepare.
	(displaced_step_prepare): Use displaced_step_clear_cleanup instead
	of cleanup_displaced_step_closure.
	(handle_inferior_event, keep_going): Use thread architecture instead
	of current_gdbarch.