* aix-thread.c (supply_gprs64, supply_reg32, supply_fprs,

	* aix-thread.c (supply_gprs64, supply_reg32, supply_fprs,
	supply_sprs64, supply_sprs32): Add REGCACHE parameter, use it
	instead of current_regcache.
	(fetch_regs_user_thread, fetch_regs_kernel_thread): Add
	REGCACHE parameter, pass it to supply_ routines.
	(aix_thread_fetch_registers): Pass current_regcache to
	fetch_regs_user_thread and fetch_regs_kernel_thread.

	(fill_gprs64, fill_gprs32, fill_fprs, fill_sprs64, fill_sprs32):
	Add REGCACHE parameter, use it instead of current_regcache.
	Call regcache_valid_p instead of register_cached.
	(store_regs_user_thread, store_regs_kernel_thread): Likewise.
	Also, pass REGCACHE to fill_ routines.
	(aix_thread_store_registers): Pass current_regcache to
	store_regs_user_thread and store_regs_kernel_thread.