* config/m68hc11/m68hc11.md ("cmpqi_1"): Fix constraints.
("tsthi_1"): Avoid allocation in register y.
("*movqi_68hc12"): Reorganize and fix constraints.
("zero_extendqisi2"): Prefer d over x and y for operand 1.
("addqi3"): Likewise.
("addhi3"): Fix constraints.
("*logicalhi3_zexthi"): Disparage soft registers.
From-SVN: r45908
