gdb/

	gdb/
	* infrun.c (displaced_step_fixup): Move some code ...
	(displaced_step_restore): ... here.  New function.
	(handle_inferior_event): Cleanup displaced stepping state for both
	child and parent when get forked or vforked event.
	* regcache.c (get_thread_arch_aspace_regcache): New function.
	get_thread_arch_regcache (): Call it.