* bb-reorder.c (fix_crossing_unconditional_branches): Remove a
	set-but-unused variable.

	* cgraph.c (cgraph_release_function_body): Clear cfun->cfg to make
	basic blocks of released function bodies garbage-collectable.

	* ree.c (find_and_remove_re): Do not call df_finish_pass here.
	(struct rtl_opt_pass): Add TODO_df_finish.

	* rtl.def (DEFINE_SUBST, DEFINE_SUBST_ATTR): Add documentation.

From-SVN: r197533