Fix build breakage.

dart/lib/compiler/implementation/ssa/nodes.dart

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 interface HVisitor<R> {
   R visitAdd(HAdd node);
   R visitBitAnd(HBitAnd node);
   R visitBitNot(HBitNot node);
   R visitBitOr(HBitOr node);
   R visitBitXor(HBitXor node);
@@ skipping 1381 matching lines @@
 
   // TODO(1603): The class should be marked as abstract.
   abstract BinaryOperation get operation();
 }
 
 class HAdd extends HBinaryArithmetic {
   HAdd(HStatic target, HInstruction left, HInstruction right)
       : super(target, left, right);
   accept(HVisitor visitor) => visitor.visitAdd(this);
 
-  bool get builtin() => left.isNumber() && right.isNumber();
-
   HType computeTypeFromInputTypes() {
     if (left.isInteger() && right.isInteger()) return left.propagatedType;
     if (left.isNumber()) {
       if (left.isDouble() || right.isDouble()) return HType.DOUBLE;
       return HType.NUMBER;
     }
     return HType.UNKNOWN;
   }
 
   HType computeDesiredTypeForNonTargetInput(HInstruction input) {
@@ skipping 1170 matching lines @@
   HBasicBlock get start() => expression.start;
   HBasicBlock get end() {
     // We don't create a switch block if there are no cases.
     assert(!statements.isEmpty());
     return statements.last().end;
   }
 
   bool accept(HStatementInformationVisitor visitor) =>
       visitor.visitSwitchInfo(this);
 }