Adds Simulator Longjmp and enables many tests for arm64.

runtime/vm/object_id_ring_test.cc

 // Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
-// TODO(zra): Remove when tests are ready to enable.
-#include "platform/globals.h"
-#if !defined(TARGET_ARCH_ARM64)
-
 #include "platform/assert.h"
 #include "vm/globals.h"
 #include "vm/object_id_ring.h"
 #include "vm/unit_test.h"
 #include "vm/dart_api_impl.h"
 #include "vm/dart_api_state.h"
 
 namespace dart {
 
 
@@ skipping 168 matching lines @@
   // those ids.
   heap->CollectGarbage(Heap::kOld);
   RawObject* raw_object_moved1 = ring->GetObjectForId(raw_obj_id1);
   RawObject* raw_object_moved2 = ring->GetObjectForId(raw_obj_id2);
   // Objects should now be null.
   EXPECT_EQ(Object::null(), raw_object_moved1);
   EXPECT_EQ(Object::null(), raw_object_moved2);
 }
 
 }  // namespace dart
-
-#endif  // !defined(TARGET_ARCH_ARM64)