tests for inlining between IR and AST functions

sdk/lib/_internal/lib/annotations.dart

 // Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 part of _js_helper;
 
 /// Tells the optimizing compiler that the annotated method has no
 /// side-effects.
 /// Requires @NoInline() to function correctly.
 class NoSideEffects {
   const NoSideEffects();
 }
 
 /// Tells the optimizing compiler that the annotated method cannot throw.
 /// Requires @NoInline() to function correctly.
 class NoThrows {
   const NoThrows();
 }
 
 /// Tells the optimizing compiler to not inline the annotated method.
 class NoInline {
   const NoInline();
 }
+
+// Ensures that the annotated method is represented internally using
+// IR nodes ([:value == true:]) or AST nodes ([:value == false:]).
+class IrRepresentation {
+  final bool value;
+  const IrRepresentation(this.value);
+}