Check for cached transition to ExternalArray elements kind.

test/cctest/test-api.cc

Index: test/cctest/test-api.cc
diff --git a/test/cctest/test-api.cc b/test/cctest/test-api.cc
index 003a51134dc3fa35d9be4017fa1702171c76ee0d..aecd1405708575017ee1d5bb90e3807f501df065 100644
--- a/test/cctest/test-api.cc
+++ b/test/cctest/test-api.cc
@@ -21404,6 +21404,23 @@ THREADED_TEST(Regress142088) {
 }
 
 
+THREADED_TEST(Regress3337) {
+  LocalContext context;
+  v8::Isolate* isolate = context->GetIsolate();
+  v8::HandleScope scope(isolate);
+  Local<v8::Object> o1 = Object::New(isolate);
+  Local<v8::Object> o2 = Object::New(isolate);
+  i::Handle<i::JSObject> io1 = v8::Utils::OpenHandle(*o1);
+  i::Handle<i::JSObject> io2 = v8::Utils::OpenHandle(*o2);
+  CHECK(io1->map() == io2->map());
+  o1->SetIndexedPropertiesToExternalArrayData(
+      NULL, v8::kExternalUint32Array, 0);
+  o2->SetIndexedPropertiesToExternalArrayData(
+      NULL, v8::kExternalUint32Array, 0);
+  CHECK(io1->map() == io2->map());
+}
+
+
 THREADED_TEST(Regress137496) {
   i::FLAG_expose_gc = true;
   LocalContext context;