m68hc11-protos.h (ix_reg): Declare.

m68hc11-protos.h (ix_reg): Declare.

	* config/m68hc11/m68hc11-protos.h (ix_reg): Declare.
	* config/m68hc11/m68hc11.md ("addsi3"): Use general_operand for sources.
	(splits): Remove unused add splits.
	("*addhi3_68hc12"): Tune constraints.
	("addhi_sp"): Try to use X instead of Y in all cases and if the
	constant fits in 8-bits and D is dead use abx/aby instructions.
	("*addhi3"): Remove extern declaration of ix_reg.
	("*subsi3"): Optimize and provide new split.
	("subhi3"): Cleanup.
	("*subhi3_sp"): Avoid saving X if we know it is dead.
	(arith splits): For 68hc12 save the address register on the stack
	and do the arithmetic operation with a pop.

From-SVN: r50880