Remove BB_FOOTER scaffolding

Remove BB_FOOTER scaffolding

gcc/
	* basic-block.h (struct rtl_bb_info): Strengthen field "footer_"
	from rtx to rtx_insn *.
	(BB_FOOTER): Replace function with access macro.
	(SET_BB_FOOTER): Delete.

	* cfgcleanup.c (try_optimize_cfg): Replace uses of SET_BB_FOOTER
	with BB_FOOTER.
	* cfgrtl.c (try_redirect_by_replacing_jump): Likewise.
	(emit_barrier_after_bb): Likewise.
	(record_effective_endpoints): Likewise.
	(relink_block_chain): Likewise.
	(fixup_fallthru_exit_predecessor): Likewise.
	(cfg_layout_duplicate_bb): Likewise.
	(cfg_layout_split_block): Likewise.
	(cfg_layout_delete_block): Likewise.
	(cfg_layout_merge_blocks): Likewise.
	(BB_FOOTER): Delete function.
	(SET_BB_FOOTER): Delete function.
	* combine.c (update_cfg_for_uncondjump): Replace uses of
	SET_BB_FOOTER with BB_FOOTER.

/
	* rtx-classes-status.txt (TODO): Remove SET_BB_FOOTER.

From-SVN: r214470