Revert "Split TypedSelector into Selector and TypeMask."

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;
-import '../types/types.dart' show TypeMask;
 import '../universe/universe.dart' show Selector, SelectorKind;
 
 import 'builtin_operator.dart';
 export 'builtin_operator.dart';
 
 abstract class Node {
   /// A pointer to the parent node. Is null until set by optimization passes.
   Node parent;
 
   accept(Visitor visitor);
@@ skipping 242 matching lines @@
 ///
 /// The [selector] records the names of named arguments. The value of named
 /// arguments occur at the end of the [arguments] list, in normalized order.
 ///
 /// Discussion:
 /// If the [selector] is a [TypedSelector], the type information contained
 /// there is used by optimization passes. This is likely to change.
 class InvokeMethod extends Expression implements Invoke {
   Reference<Primitive> receiver;
   Selector selector;
-  TypeMask mask;
   final List<Reference<Primitive>> arguments;
   final Reference<Continuation> continuation;
   final SourceInformation sourceInformation;
 
   /// If true, it is known that the receiver cannot be `null`.
   ///
   /// This field is `null` until initialized by optimization phases.
   bool receiverIsNotNull;
 
   InvokeMethod(Primitive receiver,
                this.selector,
-               this.mask,
                List<Primitive> arguments,
                Continuation continuation,
                {this.sourceInformation})
       : this.receiver = new Reference<Primitive>(receiver),
         this.arguments = _referenceList(arguments),
         this.continuation = new Reference<Continuation>(continuation);
 
   accept(Visitor visitor) => visitor.visitInvokeMethod(this);
 }
 
@@ skipping 962 matching lines @@
   const RemovalVisitor();
 
   processReference(Reference reference) {
     reference.unlink();
   }
 
   static void remove(Node node) {
     (const RemovalVisitor()).visit(node);
   }
 }