Build new IR for functions returning a constant

sdk/lib/_internal/compiler/implementation/elements/elements.dart

Index: sdk/lib/_internal/compiler/implementation/elements/elements.dart
diff --git a/sdk/lib/_internal/compiler/implementation/elements/elements.dart b/sdk/lib/_internal/compiler/implementation/elements/elements.dart
index 6e9281c6ca91143dda11ba806711a28ac464f9a0..f31411e0548776d60c6ba80d886e5aaf570eebcf 100644
--- a/sdk/lib/_internal/compiler/implementation/elements/elements.dart
+++ b/sdk/lib/_internal/compiler/implementation/elements/elements.dart
@@ -28,6 +28,8 @@ import '../scanner/scannerlib.dart' show Token,
                                          isUserDefinableOperator,
                                          isMinusOperator;
 
+import '../ir/ir_nodes.dart' show IrNode;
+
 const int STATE_NOT_STARTED = 0;
 const int STATE_STARTED = 1;
 const int STATE_DONE = 2;
@@ -178,6 +180,9 @@ abstract class Element implements Spannable {
   Node parseNode(DiagnosticListener listener);
   DartType computeType(Compiler compiler);
 
+  bool hasIrNode(Compiler compiler);
+  IrNode irNode(Compiler compiler);
+
   bool isFunction();
   bool isConstructor();
   bool isClosure();