remove more ifdef HAVE_cc0

remove more ifdef HAVE_cc0

gcc/ChangeLog:

2015-04-21  Trevor Saunders  <tbsaunde+gcc@tbsaunde.org>

	* combine.c (find_single_use): Remove HAVE_cc0 ifdef for code
	that is trivially ded on non cc0 targets.
	(simplify_set): Likewise.
	(mark_used_regs_combine): Likewise.
	* cse.c (new_basic_block): Likewise.
	(fold_rtx): Likewise.
	(cse_insn): Likewise.
	(cse_extended_basic_block): Likewise.
	(set_live_p): Likewise.
	* rtlanal.c (canonicalize_condition): Likewise.
	* simplify-rtx.c (simplify_binary_operation_1): Likewise.

From-SVN: r222295