nvptx.c (write_one_arg): Rename to ...

	* config/nvptx/nvptx.c (write_one_arg): Rename to ...
	(write_arg_mode): ... here.  Update callers.
	(write_arg): Rename to ...
	(write__arg_type): ... here.  Update callers.
	(write_return_mode): New fn, broken out of ...
	(write_return): ... here.  Rename to ...
	(write_return_type): ... here.  Call it. Update callers.
	(write_fn_proto_from_insn): Use write_arg_mode and
	write_return_mode.
	(init_frame): New fn.
	(nvptx_declare_function_name): Call it for frame and varargs. Only
	emit outgoing static chain, if it's live.
	(nvptx_output_return): Use reg_names for return reg name.
	(nvptx_output_call_insn): Likewise.
	(nvptx_reorg): Mark unused hard regs too.

From-SVN: r231663