re PR target/36467 ([avr] Missed optimization with pointer arithmetic and mul*)

re PR target/36467 ([avr] Missed optimization with pointer arithmetic and mul*)

	PR target/36467
	PR target/49687
	* config/avr/avr.md (mulhi3): Use register_or_s9_operand for
	operand2 and expand appropriately if there is a CONST_INT in
	operand2.
	(usmulqihi3): New insn.
	(*sumulqihi3): New insn.
	(*osmulqihi3): New insn.
	(*oumulqihi3): New insn.
	(*muluqihi3.uconst): New insn_and_split.
	(*muluqihi3.sconst): New insn_and_split.
	(*mulsqihi3.sconst): New insn_and_split.
	(*mulsqihi3.uconst): New insn_and_split.
	(*mulsqihi3.oconst): New insn_and_split.
	(*ashifthi3.signx.const): New insn_and_split.
	(*ashifthi3.signx.const7): New insn_and_split.
	(*ashifthi3.zerox.const): New insn_and_split.
	(mulsqihi3): New insn.
	(muluqihi3): New insn.
	(muloqihi3): New insn.
	* config/avr/predicates.md (const_2_to_7_operand): New.
	(const_2_to_6_operand): New.
	(u8_operand): New.
	(s8_operand): New.
	(o8_operand): New.
	(s9_operand): New.
	(register_or_s9_operand): New.

From-SVN: r176527