dart2js: don't pass the supername to visitFields.

pkg/compiler/lib/src/js_backend/native_emitter.dart

Index: pkg/compiler/lib/src/js_backend/native_emitter.dart
diff --git a/pkg/compiler/lib/src/js_backend/native_emitter.dart b/pkg/compiler/lib/src/js_backend/native_emitter.dart
index d58559459fe383612e018ced02e7d83443bd215e..7cffb96f60f587ec047a9417c9eaac32f9e7a2fa 100644
--- a/pkg/compiler/lib/src/js_backend/native_emitter.dart
+++ b/pkg/compiler/lib/src/js_backend/native_emitter.dart
@@ -279,16 +279,6 @@ class NativeEmitter {
   }
 
   ClassBuilder generateNativeClass(ClassElement classElement) {
-    ClassBuilder builder;
-    if (compiler.hasIncrementalSupport) {
-      builder = cachedBuilders[classElement];
-      if (builder != null) return builder;
-      builder = new ClassBuilder(classElement, backend.namer);
-      cachedBuilders[classElement] = builder;
-    } else {
-      builder = new ClassBuilder(classElement, backend.namer);
-    }
-
     // TODO(sra): Issue #13731- this is commented out as part of custom element
     // constructor work.
     //assert(!classElement.hasBackendMembers);
@@ -304,10 +294,21 @@ class NativeEmitter {
 
     String superName = backend.namer.getNameOfClass(superclass);
 
+    ClassBuilder builder;
+    if (compiler.hasIncrementalSupport) {
+      builder = cachedBuilders[classElement];
+      if (builder != null) return builder;
+      builder = new ClassBuilder(classElement, backend.namer);
+      cachedBuilders[classElement] = builder;
+    } else {
+      builder = new ClassBuilder(classElement, backend.namer);
+    }
+    builder.superName = superName;

[floitsch, 2014/11/25 15:17:13]

Line 306 is new. The rest is copied from above.

+
     emitterTask.oldEmitter.classEmitter.emitClassConstructor(
         classElement, builder);
     bool hasFields = emitterTask.oldEmitter.classEmitter.emitFields(
-        classElement, builder, superName, classIsNative: true);
+        classElement, builder, classIsNative: true);
     int propertyCount = builder.properties.length;
     emitterTask.oldEmitter.classEmitter.emitClassGettersSetters(
         classElement, builder);