* calls.c: Re-install both patches reverted by last patch.
	(struct arg_data): New field tail_call_reg.
	(initialize_argument_information): Initialize tail_call_reg
	(load_register_parameters): New argument flags, use
	tail_call_reg when emiting tail call sequence.
	(expand_call): Update call of load_register_parameters;
	copy unadjusted_args_size to adjusted_args_size.

From-SVN: r33913