cfgcleanup.c: Use rtx_insn (also touches basic-block.h and ifcvt.c)

cfgcleanup.c: Use rtx_insn (also touches basic-block.h and ifcvt.c)

gcc/
2014-08-21  David Malcolm  <dmalcolm@redhat.com>

	* basic-block.h (flow_find_cross_jump): Strengthen params 3 and 4
	"f1" and "f2" from rtx * to rtx_insn **.
	(flow_find_head_matching_sequence): Likewise.

	* cfgcleanup.c (try_simplify_condjump): Strengthen local
	"cbranch_insn" from rtx to rtx_insn *.
	(thread_jump): Likewise for local "insn".
	(try_forward_edges): Likewise for local "last".
	(merge_blocks_move_predecessor_nojumps): Likewise for local "barrier".
	(merge_blocks_move_successor_nojumps): Likewise for locals "barrier",
	"real_b_end".
	(can_replace_by): Likewise for params "i1", "i2".
	(old_insns_match_p): Likewise.
	(merge_notes): Likewise.
	(walk_to_nondebug_insn): Likewise for param "i1".
	(flow_find_cross_jump): Strengthen params "f1" and "f2" from rtx *
	to rtx_insn **.  Strengthen locals "i1", "i2", "last1", "last2",
	"afterlast1", "afterlast2" from rtx to rtx_insn *.
	(flow_find_head_matching_sequence): Strengthen params "f1" and
	"f2" from rtx * to rtx_insn **.  Strengthen locals "i1", "i2",
	"last1", "last2", "beforelast1", "beforelast2" from rtx to
	rtx_insn *.
	(outgoing_edges_match): Likewise for locals "last1", "last2".
	(try_crossjump_to_edge): Likewise for local "insn".
	Replace call to for_each_rtx with for_each_rtx_in_insn.

	(try_crossjump_to_edge): Likewise for locals "newpos1", "newpos2".
	(try_head_merge_bb): Likewise for locals "e0_last_head_, "jump",
	"e0_last", "e_last", "head", "curr", "insn".  Strengthen locals
	"headptr", "currptr", "nextptr" from rtx * to rtx_insn **.
	(try_optimize_cfg): Strengthen local "last" from rtx to
	rtx_insn *.
	(delete_dead_jumptables): Likewise for locals "insn", "next",
	"label".

	* ifcvt.c (cond_exec_process_if_block): Likewise for locals
	"rtx then_last_head", "rtx else_last_head", "rtx then_first_tail",
	"rtx else_first_tail", to reflect the basic-block.h changes above.

From-SVN: r214292