(fill_sprs64, fill_sprs32): Add selected asserts to make sure that
	register sizes (from register cache) match size of buffer holding
	register data.
	(fill_sprs32): Change parameter types to match those in the ptrace()
	buffer.
	(store_regs_lib): Likewise, but for 32-bit temporary variables.
	(ops_prepare_to_store): Rename loop variable ``i'' to ``regno''.

	* aix-thread.c (supply_sprs64): Cosmetic change.
	(supply_sprs32): Cosmetic change.
	(fill_gprs64, fill_gprs32, fill_fprs, fill_sprs32): New funcs.
	(fill_sprs64): Use regcache_collect instead of read_register.
	(store_regs_lib): Use regcache_collect instead of
	read_register.  Use fill_sprs32 instead of fill_sprs64,
	if debugging a 32-bit architecture.
	(store_regs_kern): Use fill_gprs64 etc. to pull the values
	out of the register cache, instead of passing a pointer into
	the register cache directly to ptrace.  Use regcache_collect
	insteaad of read_register.
	(ops_prepare_to_store): Use target_read_registers instead
	of read_register_bytes.