tests for inlining between IR and AST functions

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

Index: sdk/lib/_internal/compiler/implementation/ir/ir_builder.dart
diff --git a/sdk/lib/_internal/compiler/implementation/ir/ir_builder.dart b/sdk/lib/_internal/compiler/implementation/ir/ir_builder.dart
index 4132db247bd0d23f14ed74937d4294ac47356547..351e18bc84348dbcb638c4fa344238873fe490ef 100644
--- a/sdk/lib/_internal/compiler/implementation/ir/ir_builder.dart
+++ b/sdk/lib/_internal/compiler/implementation/ir/ir_builder.dart
@@ -83,6 +83,7 @@ class IrBuilderTask extends CompilerTask {
             unlinkTreeAndToken(element);
           }
         }
+        ensureIr(element);
       });
     });
   }
@@ -114,9 +115,23 @@ class IrBuilderTask extends CompilerTask {
     // TODO(lry): support native functions (also in [visitReturn]).
     if (function.isNative()) return false;
 
+    // Methods annotated @IrRepresentation(false).
+    if (backend.enforceAstRepresentation(function)) return false;
+
     return true;
   }
 
+  /**
+   * If no IR was built for [element], ensure it is not annotated
+   * @IrRepresentation(true).
+   */
+  bool ensureIr(Element element) {
+    // Ensure that the method is not annotated
+    if (!compiler.irBuilder.hasIr(element) &&

[ngeoffray, 2013/12/17 12:52:33]

Since this is for testing purposes, should you assert instead?

[lukas, 2013/12/17 13:03:43]

Then the "ir_representation_test.dart" would compile in unchecked mode (it's
supposed to fail, see my last comment
https://codereview.chromium.org/108333007/diff/1/tests/compiler/dart2js_nativ...)

+        compiler.backend.enforceIrRepresentation(element))
+      compiler.internalError("coult not build IR", element: element);
+  }
+
   void unlinkTreeAndToken(element) {
     // Ensure the function signature has been computed (requires the AST).
     assert(element is !FunctionElementX || element.functionSignature != null);