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

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 16404 matching lines @@
   }
   {
     v8::Isolate::Scope isolate_scope(isolate);
     v8::HandleScope handle_scope;
     context = v8::Context::New();
     v8::Context::Scope context_scope(context);
     Local<Value> v = CompileRun("22");
     CHECK(v->IsNumber());
     CHECK_EQ(22, static_cast<int>(v->NumberValue()));
   }
+  isolate->Dispose();
 }
 
 class InitDefaultIsolateThread : public v8::internal::Thread {
  public:
   enum TestCase {
     IgnoreOOM,
     SetResourceConstraints,
     SetFatalHandler,
     SetCounterFunction,
     SetCreateHistogramFunction,
@@ skipping 1780 matching lines @@
   i::Semaphore* sem_;
   volatile int sem_value_;
 };
 
 
 THREADED_TEST(SemaphoreInterruption) {
   ThreadInterruptTest().RunTest();
 }
 
 #endif  // WIN32