* config/sparc/sparc.c (function_arg_record_value_1): Skip

	fields with zero length.
	(function_arg_record_value_2): Likewise.
	(function_arg_record_value_3): Use smallest_mode_for_size
	instead of mode_for_size.
	(function_arg_union_value): Return naked register for unions
	with zero length.


git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@90180 138bc75d-0d04-0410-961f-82ee72b054a4