Split TypedSelector into Selector and TypeMask.

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

Index: pkg/compiler/lib/src/cps_ir/cps_ir_nodes.dart
diff --git a/pkg/compiler/lib/src/cps_ir/cps_ir_nodes.dart b/pkg/compiler/lib/src/cps_ir/cps_ir_nodes.dart
index 164663372e22cb8250b1c25be82a45353fa5b459..f29614b9246881182e7695ecb1fd68028e29faa6 100644
--- a/pkg/compiler/lib/src/cps_ir/cps_ir_nodes.dart
+++ b/pkg/compiler/lib/src/cps_ir/cps_ir_nodes.dart
@@ -8,6 +8,7 @@ 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;
 
 abstract class Node {
@@ -267,6 +268,7 @@ class InvokeStatic extends Expression implements Invoke {
 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;
@@ -278,6 +280,7 @@ class InvokeMethod extends Expression implements Invoke {
 
   InvokeMethod(Primitive receiver,
                this.selector,
+               this.mask,
                List<Primitive> arguments,
                Continuation continuation,
                {this.sourceInformation})