(addsi_lshrsi_31): Use match_dup, not constraint "1", for matching

inputs.

From-SVN: r9840

gcc/config/m68k/m68k.md

@@ -2089,7 +2089,7 @@
   [(set (match_operand:SI 0 "general_operand" "=dm")
     (plus:SI (lshiftrt:SI (match_operand:SI 1 "general_operand" "rm")
             (const_int 31))
-        (match_operand:SI 2 "general_operand" "1")))]
+        (match_dup 1)))]
   ""
   "*
 {