(record_reg_classes): There is no alt_cost

for a pair of matching args if they are the same pseudo reg.

From-SVN: r5597

gcc/regclass.c

@@ -998,6 +998,8 @@ record_reg_classes (n_alts, n_ops, ops, modes, constraints, insn)
 		     instruction.  */
 
 		  this_op_costs[i] = this_op_costs[j];
+		  if (! (GET_CODE (op) == REG && rtx_equal_p (op, ops[j])))
+		    /* No cost if both are the same pseudo reg.  */
 		    if (! find_reg_note (insn, REG_DEAD, op))
 		      alt_cost += 2;