* system.h (FUNCTION_ARG_KEEP_AS_REFERENCE): Poison.
	* config/frv/frv-protos.h: Remove the prototype for
	frv_function_arg_keep_as_reference.
	* config/frv/frv.c (frv_function_arg_keep_as_reference):
	Remove.
	* config/frv/frv.h (FUNCTION_ARG_KEEP_AS_REFERENCE): Likewise.
	* config/stormy16/stormy16.h: Remove the commented-out
	definition of FUNCTION_ARG_KEEP_AS_REFERENCE.

From-SVN: r77148