bitmap.c (bitmap_set_range): Handle count==1 specially.

bitmap.c (bitmap_set_range): Handle count==1 specially.

gcc/
	* bitmap.c (bitmap_set_range): Handle count==1 specially.
	(bitmap_clear_range): Likewise.
	* cfgcleanup.c (mark_effect): Use bitmap_clear_range and
	bitmap_set_range unconditionally.
	* df-problems.c (df_simulate_one_insn_forwards): Likewise.
	* df-scan.c (df_mark_reg): Likewise.
	* haifa-sched.c (setup_ref_regs): Likewise.
	* sched-rgn.c (update_live_1): Likewise.

From-SVN: r223344