Fixed a memory leak in v8 and another one in d8.

src/isolate.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 1530 matching lines @@
   ASSERT(context() == NULL || context()->IsContext());
   return from + sizeof(ThreadLocalTop);
 }
 
 
 Isolate::ThreadDataTable::ThreadDataTable()
     : list_(NULL) {
 }
 
 
+Isolate::ThreadDataTable::~ThreadDataTable() {
+  // TODO(svenpanne) The assertion below would fire if an embedder does not
+  // cleanly dispose all Isolates before disposing v8, so we are conservative
+  // and leave it out for now.
+  // ASSERT_EQ(NULL, list_);
+}
+
+
 Isolate::PerIsolateThreadData*
     Isolate::ThreadDataTable::Lookup(Isolate* isolate,
                                      ThreadId thread_id) {
   for (PerIsolateThreadData* data = list_; data != NULL; data = data->next_) {
     if (data->Matches(isolate, thread_id)) return data;
   }
   return NULL;
 }
 
 
@@ skipping 167 matching lines @@
 
   if (!IsDefaultIsolate()) {
     delete this;
   }
 
   // Restore the previous current isolate.
   SetIsolateThreadLocals(saved_isolate, saved_data);
 }
 
 
+void Isolate::GlobalTearDown() {
+  delete thread_data_table_;
+}
+
+
 void Isolate::Deinit() {
   if (state_ == INITIALIZED) {
     TRACE_ISOLATE(deinit);
 
     if (FLAG_concurrent_sweeping || FLAG_parallel_sweeping) {
       for (int i = 0; i < FLAG_sweeper_threads; i++) {
         sweeper_thread_[i]->Stop();
         delete sweeper_thread_[i];
       }
       delete[] sweeper_thread_;
@@ skipping 519 matching lines @@
 
 #ifdef DEBUG
 #define ISOLATE_FIELD_OFFSET(type, name, ignored)                       \
 const intptr_t Isolate::name##_debug_offset_ = OFFSET_OF(Isolate, name##_);
 ISOLATE_INIT_LIST(ISOLATE_FIELD_OFFSET)
 ISOLATE_INIT_ARRAY_LIST(ISOLATE_FIELD_OFFSET)
 #undef ISOLATE_FIELD_OFFSET
 #endif
 
 } }  // namespace v8::internal