dart2js cps: Make Identical a built-in and add Interceptor to Tree IR.

pkg/compiler/lib/src/cps_ir/cps_ir_nodes.dart

 // Copyright (c) 2013, 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 dart2js.ir_nodes;
 
 import '../constants/expressions.dart';
 import '../constants/values.dart' as values show ConstantValue;
 import '../dart_types.dart' show DartType, InterfaceType, TypeVariableType;
 import '../elements/elements.dart';
 import '../io/source_information.dart' show SourceInformation;
@@ skipping 686 matching lines @@
   final List<Reference<Primitive>> typeInformation;
 
   CreateInstance(this.classElement, List<Primitive> arguments,
       List<Primitive> typeInformation)
       : this.arguments = _referenceList(arguments),
         this.typeInformation = _referenceList(typeInformation);
 
   accept(Visitor visitor) => visitor.visitCreateInstance(this);
 }
 
-/// Compare objects for identity.
-///
-/// It is an error pass in a value that does not correspond to a Dart value,
-/// such as an interceptor or a box.
-class Identical extends Primitive {
-  final Reference<Primitive> left;
-  final Reference<Primitive> right;
-  Identical(Primitive left, Primitive right)
-      : left = new Reference<Primitive>(left),
-        right = new Reference<Primitive>(right);
-  accept(Visitor visitor) => visitor.visitIdentical(this);
-}
-
 class Interceptor extends Primitive {
   final Reference<Primitive> input;
   final Set<ClassElement> interceptedClasses;
   Interceptor(Primitive input, this.interceptedClasses)
       : this.input = new Reference<Primitive>(input);
   accept(Visitor visitor) => visitor.visitInterceptor(this);
 }
 
 /// Create an instance of [Invocation] for use in a call to `noSuchMethod`.
 class CreateInvocationMirror extends Primitive {
@@ skipping 237 matching lines @@
   T visitLiteralList(LiteralList node);
   T visitLiteralMap(LiteralMap node);
   T visitConstant(Constant node);
   T visitCreateFunction(CreateFunction node);
   T visitGetMutableVariable(GetMutableVariable node);
   T visitParameter(Parameter node);
   T visitContinuation(Continuation node);
   T visitMutableVariable(MutableVariable node);
   T visitNonTailThrow(NonTailThrow node);
   T visitGetStatic(GetStatic node);
-  T visitIdentical(Identical node);
   T visitInterceptor(Interceptor node);
   T visitCreateInstance(CreateInstance node);
   T visitGetField(GetField node);
   T visitCreateBox(CreateBox node);
   T visitReifyRuntimeType(ReifyRuntimeType node);
   T visitReadTypeVariable(ReadTypeVariable node);
   T visitTypeExpression(TypeExpression node);
   T visitCreateInvocationMirror(CreateInvocationMirror node);
   T visitTypeTest(TypeTest node);
   T visitApplyBuiltinOperator(ApplyBuiltinOperator node);
@@ skipping 187 matching lines @@
     node.parameters.forEach(visitParameter);
     if (node.body != null) visit(node.body);
   }
 
   processIsTrue(IsTrue node) {}
   visitIsTrue(IsTrue node) {
     processIsTrue(node);
     processReference(node.value);
   }
 
-  processIdentical(Identical node) {}
-  visitIdentical(Identical node) {
-    processIdentical(node);
-    processReference(node.left);
-    processReference(node.right);
-  }
-
   processInterceptor(Interceptor node) {}
   visitInterceptor(Interceptor node) {
     processInterceptor(node);
     processReference(node.input);
   }
 
   processCreateInstance(CreateInstance node) {}
   visitCreateInstance(CreateInstance node) {
     processCreateInstance(node);
     node.arguments.forEach(processReference);
@@ skipping 87 matching lines @@
   const RemovalVisitor();
 
   processReference(Reference reference) {
     reference.unlink();
   }
 
   static void remove(Node node) {
     (const RemovalVisitor()).visit(node);
   }
 }