ia64.c (ia64_function_arg): Use [SDT]Fmode as gr_mode for complex floats passed to unprototyped functions.

	* config/ia64/ia64.c (ia64_function_arg): Use [SDT]Fmode as gr_mode
	for complex floats passed to unprototyped functions.

	* gcc.c-torture/execute/20010605-2.c: New test.

From-SVN: r43029