s390-protos.h (s390_function_value): Declare.

s390-protos.h (s390_function_value): Declare.

	* config/s390/s390-protos.h (s390_function_value): Declare.
	* config/s390/s390.c (TARGET_RETURN_IN_MEMORY): Define.
	(s390_return_in_memory): New function.
	(s390_function_value): New function.
	(s390_function_arg_float): Return false for all arguments larger
	than 8 bytes.
	(s390_function_arg_pass_by_reference): Likewise.  Return true for
	all vector arguments.
	(s390_function_arg_integer): New function.
	(s390_function_arg_advance): Call it.  Add sanity checks.
	(s390_function_arg): Likewise.
	* config/s390/s390.h (FUNCTION_VALUE): Call s390_function_value.
	(LIBCALL_VALUE): Likewise.
	(RET_REG): Remove.
	(RETURN_IN_MEMORY): Remove.

From-SVN: r73314