alpha.md (DWI): New mode attribute.

	* config/alpha/alpha.md (DWI): New mode attribute.
	(*sadd<modesuffix>): Macroize insn from *saddl and *saddq using
	I48MODE mode iterator.
	(addv<mode>3): Macroize insn from addvsi3 and addvdi3 using
	I48MODE mode iterator.
	(neg<mode>2): Macroize insn from negsi2 and negdi2 using
	I48MODE mode iterator.
	(negv<mode>2): Macroize insn from negvsi2 and negvdi2 using
	I48MODE mode iterator.
	(sub<mode>3): Macroize insn from subsi3 and subdi3 using
	I48MODE mode iterator.
	(*ssub<modesuffix>): Macroize insn from *ssubl and *ssubq using
	I48MODE mode iterator.
	(subv<mode>3): Macroize insn from subvsi3 and subvdi3 using
	I48MODE mode iterator.
	(mul<mode>3): Macroize insn from mulsi3 and muldi3 using
	I48MODE mode iterator.
	(mulv<mode>3): Macroize insn from mulvsi3 and mulvdi3 using
	I48MODE mode iterator.
	(*iornot<mode>3): Macroize insn from *iornotsi3 and *iornotdi3 using
	I48MODE mode iterator.
	(*xornot<mode>3): Macroize insn from *xornotsi3 and *xornotdi3 using
	I48MODE mode iterator.

From-SVN: r192370