[AArch64] Use CC_Z and CC_NZ with csinc and similar instructions.

[AArch64] Use CC_Z and CC_NZ with csinc and similar instructions.

	* config/aarch64/predicates.md (aarch64_comparison_operation):
	New special predicate.
	* config/aarch64/aarch64.md (*csinc2<mode>_insn): Use
	aarch64_comparison_operation instead of matching an operator.
	Update operand numbers.
	(csinc3<mode>_insn): Likewise.
	(*csinv3<mode>_insn): Likewise.
	(*csneg3<mode>_insn): Likewise.
	(ffs<mode>2): Update gen_csinc3<mode>_insn callsite.
	* config/aarch64/aarch64.c (aarch64_get_condition_code):
	Return -1 instead of aborting on invalid condition codes.
	(aarch64_print_operand): Update aarch64_get_condition_code callsites
	to assert that the returned condition code is valid.
	* config/aarch64/aarch64-protos.h (aarch64_get_condition_code): Export.

From-SVN: r214824