dart2js: Pass type information to constructor rather than add later.

pkg/compiler/lib/src/ssa/nodes.dart

Index: pkg/compiler/lib/src/ssa/nodes.dart
diff --git a/pkg/compiler/lib/src/ssa/nodes.dart b/pkg/compiler/lib/src/ssa/nodes.dart
index a0aafb00ce276783a0884fae91d7ed057fe20b73..e3342cd5b69161e65ad5e1c8e3ddf55d83723ca2 100644
--- a/pkg/compiler/lib/src/ssa/nodes.dart
+++ b/pkg/compiler/lib/src/ssa/nodes.dart
@@ -1504,6 +1504,9 @@ abstract class HControlFlow extends HInstruction {
 class HCreate extends HInstruction {
   final ClassElement element;
 
+  /// Does this instruction have reified type information as the last input?
+  final bool hasRtiInput;
+
   /// If this field is not `null`, this call is from an inlined constructor and
   /// we have to register the instantiated type in the code generator. The
   /// [instructionType] of this node is not enough, because we also need the
@@ -1511,14 +1514,19 @@ class HCreate extends HInstruction {
   List<DartType> instantiatedTypes;
 
   HCreate(this.element, List<HInstruction> inputs, TypeMask type,
-      [this.instantiatedTypes])
+      {this.instantiatedTypes, this.hasRtiInput: false})
       : super(inputs, type);
 
-  accept(HVisitor visitor) => visitor.visitCreate(this);
-
   bool get isAllocation => true;
 
-  String toString() => 'HCreate($element)';
+  HInstruction get rtiInput {
+    assert(hasRtiInput);
+    return inputs.last;
+  }
+
+  accept(HVisitor visitor) => visitor.visitCreate(this);
+
+  String toString() => 'HCreate($element, ${instantiatedTypes})';
 }
 
 abstract class HInvoke extends HInstruction {
@@ -3330,7 +3338,7 @@ class HTypeInfoExpression extends HInstruction {
     return kind == other.kind && dartType == other.dartType;
   }
 
-  String toString() => 'HTypeInfoExpression $kindAsString $dartType';
+  String toString() => 'HTypeInfoExpression($kindAsString, $dartType)';
 
   String get kindAsString {
     switch (kind) {