* cse.c (this_insn_cc0, this_insn_cc0_mode): New global

	variables, moved out from cse_insn.
	(prev_insn): Remove this global variable).
	(new_basic_block): Don't set it.
	(cse_insn): Idem. Also, move code to delete unused CC0-setter
	insns and code to set prev_insn_cc0 and prev_insn_cc0_mode
	from here...
	(cse_extended_basic_block): ...to here.  Do not clear
	prev_insn_cc0 until after recording equivalences from jumps.


git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@119984 138bc75d-0d04-0410-961f-82ee72b054a4