Remove DEP_PRO/CON scaffolding

gcc/
	* sched-int.h (struct _dep): Strengthen fields "pro" and "con"
	from rtx to rtx_insn *.
	(DEP_PRO): Delete this function and...
	(SET_DEP_PRO): ...this function in favor of...
	(DEP_PRO): ...reinstate this macro.
	(DEP_CON): Delete this function and...
	(SET_DEP_CON): ...this function in favor of...
	(DEP_CON): ...reinstate this old macro.
	(init_dep_1): Strengthen params 2 and 3 from rtx to rtx_insn *.
	(init_dep): Likewise.
	(set_priorities): Likewise for both params.
	(sd_copy_back_deps): Likewise for params 1 and 2.

	* haifa-sched.c (priority): Likewise for param "insn" and local
	"next".
	(set_priorities): Likewise for params "head" and "tail" and local
	"insn".
	(process_insn_forw_deps_be_in_spec): Likewise for param "twin" and
	local "consumer".
	(add_to_speculative_block): Add a checked cast.
	(create_check_block_twin): Drop use of SET_DEP_CON.
	(add_jump_dependencies): Strengthen params "insn" and "jump" from
	rtx to rtx_insn *.

	* sched-deps.c (init_dep_1): Likewise for params "pro" and "con".
	Drop use of SET_DEP_PRO
	(init_dep): Strengthen params "pro" and "con" from rtx to
	rtx_insn *.
	(sd_copy_back_deps): Likewise for params "to" and "from".  Drop
	use of SET_DEP_CON.
	(DEP_PRO): Delete.
	(DEP_CON): Delete.
	(SET_DEP_PRO): Delete.
	(SET_DEP_CON): Delete.

/
	* rtx-classes-status.txt (TODO): SET_DEP_PRO and SET_DEP_CON are
	done.

From-SVN: r214530