[RS6000] Disparage altivec_mov gpr alternatives

and fix constraint '*' placement.

	* gcc/config/rs6000/altivec.md (altivec_mov<mode>): Disparage
	gpr alternatives.  Correct '*' placement on Y,r alternative.
	Add '*' on operand 1 of r,r alternative.

From-SVN: r238339

gcc/ChangeLog

+2016-07-14  Alan Modra  <amodra@gmail.com>
+
+	* gcc/config/rs6000/altivec.md (altivec_mov<mode>): Disparage
+	gpr alternatives.  Correct '*' placement on Y,r alternative.
+	Add '*' on operand 1 of r,r alternative.
+
 2016-07-14  Kyrylo Tkachov  <kyrylo.tkachov@arm.com>
 
 	* expmed.c (mult_variant, choose_mult_variant): Move declaration to...

gcc/config/rs6000/altivec.md

@@ -222,8 +222,8 @@
 
 ;; Vector move instructions.
 (define_insn "*altivec_mov<mode>"
-  [(set (match_operand:VM2 0 "nonimmediate_operand" "=Z,v,v,*Y,*r,*r,v,v,*r")
-	(match_operand:VM2 1 "input_operand" "v,Z,v,r,Y,r,j,W,W"))]
+  [(set (match_operand:VM2 0 "nonimmediate_operand" "=Z,v,v,?Y,?*r,?*r,v,v,?*r")
+	(match_operand:VM2 1 "input_operand" "v,Z,v,*r,Y,*r,j,W,W"))]
   "VECTOR_MEM_ALTIVEC_P (<MODE>mode)
    && (register_operand (operands[0], <MODE>mode) 
        || register_operand (operands[1], <MODE>mode))"