* infcall.c (value_arg_coerce): Add GDBARCH parameter. Use its

	* infcall.c (value_arg_coerce): Add GDBARCH parameter.  Use its
	associates types instead of builtin_type_ macros.
	(find_function_addr): Leave output VALUE_TYPE NULL if unknown.
	(call_function_by_hand): Use per-architecture "int" type as
	fall-back if find_function_addr returns NULL VALUE_TYPE.
	Update call to value_arg_coerce.