Revert "Dummy receiver optimization"

sdk/lib/_internal/compiler/implementation/ir/ir_pickler.dart

Index: sdk/lib/_internal/compiler/implementation/ir/ir_pickler.dart
diff --git a/sdk/lib/_internal/compiler/implementation/ir/ir_pickler.dart b/sdk/lib/_internal/compiler/implementation/ir/ir_pickler.dart
index 642e9dd08fbbae20b387411f4a547e46e0505402..317940c649542b534fde25f6f535f93099552f0c 100644
--- a/sdk/lib/_internal/compiler/implementation/ir/ir_pickler.dart
+++ b/sdk/lib/_internal/compiler/implementation/ir/ir_pickler.dart
@@ -8,8 +8,7 @@ import 'ir_nodes.dart';
 import '../dart2jslib.dart' show
     Constant, FalseConstant, TrueConstant, IntConstant, DoubleConstant,
     StringConstant, NullConstant, ListConstant, MapConstant,
-    InterceptorConstant, DummyReceiverConstant, FunctionConstant, TypeConstant,
-    ConstructedConstant,
+    InterceptorConstant, FunctionConstant, TypeConstant, ConstructedConstant,
     ConstantVisitor, ConstantSystem,
     Compiler;
 import 'dart:typed_data' show ByteData, Endianness, Uint8List;
@@ -419,7 +418,6 @@ class ConstantPickler extends ConstantVisitor {
   void visitList(ListConstant constant) => abort(constant);
   void visitMap(MapConstant constant) => abort(constant);
   void visitInterceptor(InterceptorConstant constant) => abort(constant);
-  void visitDummyReceiver(DummyReceiverConstant constant) => abort(constant);
   void visitFunction(FunctionConstant constant) => abort(constant);
   void visitType(TypeConstant constant) => abort(constant);
   void visitConstructed(ConstructedConstant constant) => abort(constant);