dart2js cps: Generate increment and compound operators.

pkg/compiler/lib/src/tree_ir/tree_ir_nodes.dart

 // Copyright (c) 2014, 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.
 
 library tree_ir_nodes;
 
 import '../constants/values.dart' as values;
 import '../dart_types.dart' show DartType, InterfaceType, TypeVariableType;
 import '../elements/elements.dart';
 import '../io/source_information.dart' show SourceInformation;
@@ skipping 725 matching lines @@
 
   accept(ExpressionVisitor visitor) => visitor.visitGetField(this);
   accept1(ExpressionVisitor1 visitor, arg) => visitor.visitGetField(this, arg);
 }
 
 class SetField extends Expression {
   Expression object;
   Element field;
   Expression value;
 
-  SetField(this.object, this.field, this.value);
+  /// If non-null, this is a compound assignment to the field, using the given
+  /// operator.  The operator must be a compoundable operator.
+  BuiltinOperator compound;
+
+  SetField(this.object, this.field, this.value, {this.compound});
 
   accept(ExpressionVisitor visitor) => visitor.visitSetField(this);
   accept1(ExpressionVisitor1 visitor, arg) => visitor.visitSetField(this, arg);
 }
 
 
 /// Read the type test property from [object]. The value is truthy/fasly rather
 /// than bool. [object] must not be `null`.
 class GetTypeTestProperty extends Expression {
   Expression object;
@@ skipping 49 matching lines @@
   GetIndex(this.object, this.index);
 
   accept(ExpressionVisitor v) => v.visitGetIndex(this);
   accept1(ExpressionVisitor1 v, arg) => v.visitGetIndex(this, arg);
 }
 
 class SetIndex extends Expression {
   Expression object;
   Expression index;
   Expression value;
+  BuiltinOperator compound;
 
-  SetIndex(this.object, this.index, this.value);
+  SetIndex(this.object, this.index, this.value, {this.compound});
 
   accept(ExpressionVisitor v) => v.visitSetIndex(this);
   accept1(ExpressionVisitor1 v, arg) => v.visitSetIndex(this, arg);
 }
 
 class ReifyRuntimeType extends Expression {
   Expression value;
   SourceInformation sourceInformation;
 
   ReifyRuntimeType(this.value, this.sourceInformation);
@@ skipping 812 matching lines @@
 
   /// Number of uses of the current fallthrough target.
   int get useCount => _stack.last.useCount;
 
   /// Indicate that a statement will fall through to the current fallthrough
   /// target.
   void use() {
     ++_stack.last.useCount;
   }
 }