* function.c (STACK_BYTES): Move definition to head of file.
	(assign_parms): Don't pass current_function_pretend_args_size
	directly to SETUP_INCOMING_VARARGS.  For partial register arguments,
	round current_function_pretend_args_size up to STACK_BYTES.  Skip any
	excess before laying out the argument.

From-SVN: r71372