2008-05-16  Kenneth Zadeck <zadeck@naturalbridge.com>

	* ifcvt.c (dead_or_predicable): Rename
	df_simulate_one_insn_backwards to df_simulate_one_insn.
	* recog.c (peephole2_optimize): Ditto.
	* rtl-factoring.c (collect_pattern_seqs, clear_regs_live_in_seq): 
	Ditto.
	* df.h: Rename df_simulate_one_insn_backwards to
	df_simulate_one_insn.  and delete df_simulate_one_insn_forwards.
	* df-problems.c (df_simulate_artificial_refs_at_top) Reversed
	scanning of defs and uses.
	(df_simulate_one_insn_backwards): Renamed to df_simulate_one_insn.
	(df_simulate_one_insn_forwards): Removed.

From-SVN: r135422