tests for inlining between IR and AST functions

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

Index: sdk/lib/_internal/compiler/implementation/compiler.dart
diff --git a/sdk/lib/_internal/compiler/implementation/compiler.dart b/sdk/lib/_internal/compiler/implementation/compiler.dart
index 7846c9ac1a4ff0b44369ffe33d900d32d7c0790d..6098fad13be7aaa266bd72593a3ad891d9ae957a 100644
--- a/sdk/lib/_internal/compiler/implementation/compiler.dart
+++ b/sdk/lib/_internal/compiler/implementation/compiler.dart
@@ -281,6 +281,9 @@ abstract class Backend {
   /// optimizations don't see those calls.
   bool canBeUsedForGlobalOptimizations(Element element) => true;
 
+  bool enforceIrRepresentation(Element element) => false;
+  bool enforceAstRepresentation(Element element) => false;
+
   /// Called when [enqueuer]'s queue is empty, but before it is closed.
   /// This is used, for example, by the JS backend to enqueue additional
   /// elements needed for reflection.