stmt.c (expand_null_return_1): Remove code to generate simple returns and "use_goto" argument.

	* stmt.c (expand_null_return_1): Remove code to generate simple returns
	and "use_goto" argument.
	(expand_null_return, expand_value_return): Update all callers.
	* function.c (expand_function_end): Remove code to generate simple
	return.
	* config/vax/vax.md (epilogue): New expander for function return.
	* doc/md.texi (epilogue): Remove "if defined".

From-SVN: r44750