* config/avr/avr-protos.h (function_arg): Delete.
(function_arg_advance): Delete.
* config/avr/avr.h (FUNCTION_ARG, FUNCTION_ARG_ADVANCE): Delete.
* config/avr/avr.c (function_arg): Rename to...
(avr_function_arg): ...this. Make static. Take a const_tree and
a bool.
(function_arg_advance): Rename to...
(avr_function_arg_advance): ...this. Make static. Take a
const_tree and a bool.
(TARGET_FUNCTION_ARG, TARGET_FUNCTION_ARG_ADVANCE): Define.