* config/m68hc11/m68hc11.md ("*addhi3_68hc12"): Accept any constant
when adding to X and Y since leax/leay are fast.
("*addhi3"): Accept 'I' constraint when adding to address register.
("rotlhi3"): Operand 1 must be a register_operand.
(peephole2): New peephole to optimize some adds.
* config/m68hc11/m68hc11.h (CONST_OK_FOR_LETTER_P): Use 'I' constraint
to represent -2 .. 2 small integer range.
From-SVN: r64127
