Check for cached transition to ExternalArray elements kind.

test/cctest/test-api.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 21386 matching lines @@
                      SetterWhichSetsYOnThisTo23);
   context->Global()->Set(v8_str("obj"), templ->NewInstance());
 
   CompileRun("function load(x) { return x.foo; }"
              "var o = Object.create(obj);"
              "%OptimizeObjectForAddingMultipleProperties(obj, 1);"
              "load(o); load(o); load(o); load(o);");
 }
 
 
+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;
   v8::HandleScope scope(context->GetIsolate());
 
   // Compile a try-finally clause where the finally block causes a GC
   // while there still is a message pending for external reporting.
   TryCatch try_catch;
   try_catch.SetVerbose(true);
   CompileRun("try { throw new Error(); } finally { gc(); }");
@@ skipping 1255 matching lines @@
   Local<Script> script = v8::ScriptCompiler::Compile(
       isolate, &script_source);
   Local<Value> script_name = script->GetUnboundScript()->GetScriptName();
   CHECK(!script_name.IsEmpty());
   CHECK(script_name->IsString());
   String::Utf8Value utf8_name(script_name);
   CHECK_EQ(url, *utf8_name);
   int line_number = script->GetUnboundScript()->GetLineNumber(0);
   CHECK_EQ(13, line_number);
 }