* rtl.h (only_sets_cc0_p): New prototype.
	* jump.c (sets_cc0_p): Handle INSN.
	(only_sets_cc0_p): New function.
	* flow.c (merge_blocks_nomove): Use only_sets_cc0_p.
	(tidy_fallthru_edge): Likewise.
	* integrate.c (copy_insn_list): Likewise.
	* unroll.c (unroll_loop): Likewise.
	(copy_loop_body): Likewise.

From-SVN: r44927