Dart2js option to dump info about compilation

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

Index: sdk/lib/_internal/compiler/implementation/js_backend/backend.dart
diff --git a/sdk/lib/_internal/compiler/implementation/js_backend/backend.dart b/sdk/lib/_internal/compiler/implementation/js_backend/backend.dart
index 17c53c0f1f027e8c8b16046eb821f7c143247933..a6d83d6c4d0cb4691aeb2b3b8516d304b35c7145 100644
--- a/sdk/lib/_internal/compiler/implementation/js_backend/backend.dart
+++ b/sdk/lib/_internal/compiler/implementation/js_backend/backend.dart
@@ -1945,6 +1945,12 @@ class JavaScriptBackend extends Backend {
           element, "@NoSideEffects() should always be combined with @NoInline");
     }
   }
+
+  CodeBuffer codeOf(FunctionElement functionElement) {
+    return generatedCode.containsKey(functionElement)

[ahe, 2013/12/02 15:20:26]

I'm not too fond of looking up things twice in a table, and prefer this style:

jsAst.Node code = generatedCode[functionElement];
return code == null ? null : jsAst.prettyPrint(code, compiler);

+        ? jsAst.prettyPrint(generatedCode[functionElement], compiler)
+        : null;
+  }
 }
 
 /// Records that [constant] is used by [user.element].