m68hc11.md ("*addhi3_68hc12"): Accept any constant when adding to X and Y since leax...

m68hc11.md ("*addhi3_68hc12"): Accept any constant when adding to X and Y since leax/leay are fast.

	* 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