dart2js cps: Scalar replacement of aggregates

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 6aeb3d9bcbec13ec652b970a5d5356a98f028b35..b685c4582b9235c20c78583dc47cdbf5db06ba25 100644
--- a/pkg/compiler/lib/src/cps_ir/cps_ir_nodes.dart
+++ b/pkg/compiler/lib/src/cps_ir/cps_ir_nodes.dart
@@ -723,6 +723,8 @@ class GetField extends Primitive {
 
   bool get isSafeForElimination => objectIsNotNull;
   bool get isSafeForReordering => false;
+
+  toString() => 'GetField($field)';
 }
 
 /// Get the length of a string or native list.
@@ -872,6 +874,8 @@ class CreateInstance extends Primitive {
 
   bool get isSafeForElimination => true;
   bool get isSafeForReordering => true;
+
+  toString() => 'CreateInstance($classElement)';
 }
 
 class Interceptor extends Primitive {