* frv.cpu (UNIT): Add IACC.
	(iacc-multiply-r-r): Use it.
	* frv.opc (fr400_unit_mapping): Add entry for IACC.
	(fr500_unit_mapping, fr550_unit_mapping): Likewise.

opcodes/
	* frv-desc.h: Regenerate.
	* frv-desc.c: Regenerate.
	* frv-opc.c: Regenerate.