alpha.md (vecmodesuffix): New mode attribute.

	* config/alpha/alpha.md (vecmodesuffix): New mode attribute.
	(modesuffix): Handle V8QI and V4HI modes.
	(any_maxmin): New code iterator.
	(maxmin): New code attribute.
	(<code><mode>3): Macroize insn from {smax,smin,umax,umin}{qi,hi}3
	using any_maxmin code iterator and I12MODE mode iterator.
	(<code><mode>3): Macroize insn from {smax,smin,umax,umin}{v8qi,v4hi}3
	using any_maxmin code iterator and VEC12 mode iterator.

From-SVN: r192396