Fix and re-enable test-api/InitializeAndDispose.

src/isolate.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include <stdlib.h>
 
 #include "src/v8.h"
 
 #include "src/ast.h"
 #include "src/base/platform/platform.h"
@@ skipping 1574 matching lines @@
 
   delete this;
 
   // Restore the previous current isolate.
   SetIsolateThreadLocals(saved_isolate, saved_data);
 }
 
 
 void Isolate::GlobalTearDown() {
   delete thread_data_table_;
+  thread_data_table_ = NULL;
 }
 
 
 void Isolate::Deinit() {
   if (state_ == INITIALIZED) {
     TRACE_ISOLATE(deinit);
 
     debug()->Unload();
 
     FreeThreadResources();
@@ skipping 810 matching lines @@
   if (prev_ && prev_->Intercept(flag)) return true;
   // Then check whether this scope intercepts.
   if ((flag & intercept_mask_)) {
     intercepted_flags_ |= flag;
     return true;
   }
   return false;
 }
 
 } }  // namespace v8::internal