re PR target/64180 (PowerPC carry bit improvements)

re PR target/64180 (PowerPC carry bit improvements)

	PR target/64180
	* config/rs6000/predicates.md (adde_operand): New.
	* config/rs6000/rs6000.md (add<mode>3_carry): New.
	(*add<mode>3_imm_carry_pos): New.
	(*add<mode>3_imm_carry_0): New.
	(*add<mode>3_imm_carry_m1): New.
	(*add<mode>3_imm_carry_neg): New.
	(add<mode>3_carry_in): New.
	(*add<mode>3_carry_in_internal): New.
	(add<mode>3_carry_in_0): New.
	(add<mode>3_carry_in_m1): New.
	(subf<mode>3_carry): New.
	(*subf<mode>3_imm_carry_0): New.
	(*subf<mode>3_imm_carry_m1): New.
	(subf<mode>3_carry_in): New.
	(*subf<mode>3_carry_in_internal): New.
	(subf<mode>3_carry_in_0): New.
	(subf<mode>3_carry_in_m1): New.
	(subf<mode>3_carry_in_xx): New.

From-SVN: r218594